Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
William R. Orthwein Distinguished Professor of Law, Washington University in St. Louis School of Law
Professor Ronald M. Levin is a nationally known scholar who specializes in administrative law and related public law issues. He is the co-author of a casebook on state and federal administrative law, now in its third edition, as well as a nutshell on administrative law and process, now in its fifth edition. Formerly the law school's associate dean, he has published numerous articles and book chapters on administrative law topics, including judicial review, rulemaking, and legislative reform of the regulatory process. He also has written about the law of legislation, lobbying, and legislative ethics. Among his professional affiliations, Professor Levin has chaired the ABA Section of Administrative Law and Regulatory Practice and served as the ABA's advisor to the drafting committee to revise the Model State Administrative Procedure Act. He also has chaired the Section on Administrative Law and the Section on Legislation of the Association of American Law Schools (AALS). Currently a public member of the Administrative Conference of the United States (ACUS), he previously served as a consultant to ACUS and to the Supreme Court of Indonesia. Before joining the law faculty, Professor Levin clerked for the Hon. John C. Godbold, U.S. Court of Appeals for the Fifth Circuit, and practiced for three years in Washington, D.C., with the firm of Sutherland, Asbill & Brennan.
Senior Litigation Counsel, New Civil Liberties Alliance
Mr. Vecchione is a Senior Litigation Counsel for the non-profit New Civil Liberties Alliance representing clients against the Administrative State. He was previously President and CEO of the non-profit Cause of Action Institute, also advancing the constitutional order. He practiced at a number of D.C. area firms, including the eponymous John J. Vecchione Law, PLLC. Mr. Vecchione focuses his practice on strategic litigation in the federal district and appellate courts, including the Supreme Court of the United States. He is an experienced trial and appellate advocate having tried cases and argued appeals across the country. He is a member of the bars of the State of New York, the District of Columbia, and the Commonwealth of Virginia, as well as the Supreme Court of the United States and many federal courts. His cases are reported in scores of published opinions. He has also published pieces advancing the freedom agenda and constitutional order in the Wall Street Journal, the Washington Times and many other forums. He lives in Virginia with his wife Rebecca, sons Tommy and Joe.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
William R. Orthwein Distinguished Professor of Law, Washington University in St. Louis School of Law
Professor Ronald M. Levin is a nationally known scholar who specializes in administrative law and related public law issues. He is the co-author of a casebook on state and federal administrative law, now in its third edition, as well as a nutshell on administrative law and process, now in its fifth edition. Formerly the law school's associate dean, he has published numerous articles and book chapters on administrative law topics, including judicial review, rulemaking, and legislative reform of the regulatory process. He also has written about the law of legislation, lobbying, and legislative ethics. Among his professional affiliations, Professor Levin has chaired the ABA Section of Administrative Law and Regulatory Practice and served as the ABA's advisor to the drafting committee to revise the Model State Administrative Procedure Act. He also has chaired the Section on Administrative Law and the Section on Legislation of the Association of American Law Schools (AALS). Currently a public member of the Administrative Conference of the United States (ACUS), he previously served as a consultant to ACUS and to the Supreme Court of Indonesia. Before joining the law faculty, Professor Levin clerked for the Hon. John C. Godbold, U.S. Court of Appeals for the Fifth Circuit, and practiced for three years in Washington, D.C., with the firm of Sutherland, Asbill & Brennan.
Senior Litigation Counsel, New Civil Liberties Alliance
Mr. Vecchione is a Senior Litigation Counsel for the non-profit New Civil Liberties Alliance representing clients against the Administrative State. He was previously President and CEO of the non-profit Cause of Action Institute, also advancing the constitutional order. He practiced at a number of D.C. area firms, including the eponymous John J. Vecchione Law, PLLC. Mr. Vecchione focuses his practice on strategic litigation in the federal district and appellate courts, including the Supreme Court of the United States. He is an experienced trial and appellate advocate having tried cases and argued appeals across the country. He is a member of the bars of the State of New York, the District of Columbia, and the Commonwealth of Virginia, as well as the Supreme Court of the United States and many federal courts. His cases are reported in scores of published opinions. He has also published pieces advancing the freedom agenda and constitutional order in the Wall Street Journal, the Washington Times and many other forums. He lives in Virginia with his wife Rebecca, sons Tommy and Joe.
Samuel H. McCoy II Professor of Law, University of Virginia School of Law
John F. Duffy is the Samuel H. McCoy II Professor of Law and Class of 1966 Research Professor of Law at the University of Virginia School of Law, where he teaches administrative law, torts and intellectual property. Professor Duffy has published articles on a wide range of administrative law and regulatory issues in journals such as University of Chicago Law Review, Yale Law Journal, Stanford Law Review, Virginia Law Review, Columbia Law Review, Texas Law Review, Northwestern University Law Review, NYU Law Review, University of Pennsylvania Law Review and the Supreme Court Review. His 1998 article Administrative Common Law in Judicial Review, 77 Tex. L. Rev. 113 (1998), was one of the first articles to criticize the Chevron doctrine as being irreconcilable with § 706 of the APA; it won the American Bar Association’s Scholarship Award in Administrative Law. His 2008 article “Are Administrative Patent Judges Unconstitutional?” was covered on National Public Radio), in the New York Times (Adam Liptak, In One Flaw, Questions on Validity of 46 Judges, May 6, 2008), and in the Wall Street Journal (Dan Slater, Patently Unconstitutional, May 6, 2008). The NYT and WSJ agreed that he was “a different kind of law professor,” “one of the lucky few” whose “writings actually wind up changing the law.”
As an attorney in the courts, Duffy has twice successfully convinced the Supreme Court to overturn lower court doctrines that had been applied in many cases over decades but that were unanimously held to be irreconcilable with Supreme Court precedents. See TC Heartland v. Kraft Foods Group Brands, 581 U.S. 258 (2017); KSR v. Teleflex, 550 U.S. 398 (2007).
Prior to entering legal academics, Duffy clerked on the D.C. Circuit for Stephen Williams and on the Supreme Court for Antonin Scalia. While clerking, he became known as Justice Scalia’s “hapless law clerk,” who had been tasked with unearthing three-quarters of a century of legislative history that made “no difference” to the outcome in an otherwise forgettable case. See Conroy v. Aniskoff, 507 U.S. 511, 527-28 (1993) (Scalia, J., concurring in the judgment).
In earlier days, Duffy enjoyed being a professional blackjack player unwelcome in all Atlantic City casinos and a semi-professional road runner (best marathon time 2:24:33). He holds an A.B. in physics from Harvard and a J.D. from the University of Chicago.
Maurice and Hilda Friedman Professor of Law, Columbia Law School; CEO, New Civil Liberties Alliance
Philip Hamburger is the Maurice and Hilda Friedman Professor of Law at Columbia Law School, and Chief Executive Officer at the New Civil Liberties Alliance. Before coming to Columbia, he was the John P. Wilson Professor at the University of Chicago Law School.
He writes on constitutional law and its history—with particular emphasis on religious liberty, freedom of speech and the press, judicial office, administrative power, and unconstitutional conditions.
His books are Separation of Church and State (Harvard 2002), Law and Judicial Duty (Harvard 2008), Is Administrative Law Unlawful? (Chicago 2014), The Administrative Threat (Encounter 2017), and Liberal Suppression: Section 501(c)(3) and the Taxation of Speech (Chicago 2018). A forthcoming book is Purchasing Submission: Conditions, Power, and Freedom (Harvard 2021).
He is a member of the American Academy of Arts and Sciences, and he has served on the board of directors of the American Society for Legal History. He has twice received the Sutherland Prize for the most significant contribution to English legal history, and has been awarded the Henry Paolucci - Walter Bagehot Book Award, the Hayek Book Prize, and the Bradley Prize.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
Deputy Secretary of Agriculture, U.S. Department of Agriculture
Judge Stephen Alexander Vaden was appointed as the Deputy Secretary of the U.S. Department of Agriculture on July 7, 2025. Alongside Secretary Brooke L. Rollins, Deputy Secretary Vaden leads the Department’s operations and implements policies that support America’s food and farm systems. A native of Union City, Tennessee, Deputy Secretary Vaden brings expertise in agricultural policy, law, and rural development. Previously, he served as a judge on the U.S. Court of International Trade and as General Counsel of USDA. Throughout Deputy Secretary Vaden’s time as General Counsel, he led successful Supreme Court litigation, advanced regulatory reform, and supported the implementation of the 2018 Farm Bill. He is a graduate of Yale Law School and Vanderbilt University. A public servant with strong agricultural roots, Deputy Secretary Vaden is committed to revitalizing rural America and ensuring an abundant, affordable, and safe U.S. food supply.
Samuel H. McCoy II Professor of Law, University of Virginia School of Law
John F. Duffy is the Samuel H. McCoy II Professor of Law and Class of 1966 Research Professor of Law at the University of Virginia School of Law, where he teaches administrative law, torts and intellectual property. Professor Duffy has published articles on a wide range of administrative law and regulatory issues in journals such as University of Chicago Law Review, Yale Law Journal, Stanford Law Review, Virginia Law Review, Columbia Law Review, Texas Law Review, Northwestern University Law Review, NYU Law Review, University of Pennsylvania Law Review and the Supreme Court Review. His 1998 article Administrative Common Law in Judicial Review, 77 Tex. L. Rev. 113 (1998), was one of the first articles to criticize the Chevron doctrine as being irreconcilable with § 706 of the APA; it won the American Bar Association’s Scholarship Award in Administrative Law. His 2008 article “Are Administrative Patent Judges Unconstitutional?” was covered on National Public Radio), in the New York Times (Adam Liptak, In One Flaw, Questions on Validity of 46 Judges, May 6, 2008), and in the Wall Street Journal (Dan Slater, Patently Unconstitutional, May 6, 2008). The NYT and WSJ agreed that he was “a different kind of law professor,” “one of the lucky few” whose “writings actually wind up changing the law.”
As an attorney in the courts, Duffy has twice successfully convinced the Supreme Court to overturn lower court doctrines that had been applied in many cases over decades but that were unanimously held to be irreconcilable with Supreme Court precedents. See TC Heartland v. Kraft Foods Group Brands, 581 U.S. 258 (2017); KSR v. Teleflex, 550 U.S. 398 (2007).
Prior to entering legal academics, Duffy clerked on the D.C. Circuit for Stephen Williams and on the Supreme Court for Antonin Scalia. While clerking, he became known as Justice Scalia’s “hapless law clerk,” who had been tasked with unearthing three-quarters of a century of legislative history that made “no difference” to the outcome in an otherwise forgettable case. See Conroy v. Aniskoff, 507 U.S. 511, 527-28 (1993) (Scalia, J., concurring in the judgment).
In earlier days, Duffy enjoyed being a professional blackjack player unwelcome in all Atlantic City casinos and a semi-professional road runner (best marathon time 2:24:33). He holds an A.B. in physics from Harvard and a J.D. from the University of Chicago.
Maurice and Hilda Friedman Professor of Law, Columbia Law School; CEO, New Civil Liberties Alliance
Philip Hamburger is the Maurice and Hilda Friedman Professor of Law at Columbia Law School, and Chief Executive Officer at the New Civil Liberties Alliance. Before coming to Columbia, he was the John P. Wilson Professor at the University of Chicago Law School.
He writes on constitutional law and its history—with particular emphasis on religious liberty, freedom of speech and the press, judicial office, administrative power, and unconstitutional conditions.
His books are Separation of Church and State (Harvard 2002), Law and Judicial Duty (Harvard 2008), Is Administrative Law Unlawful? (Chicago 2014), The Administrative Threat (Encounter 2017), and Liberal Suppression: Section 501(c)(3) and the Taxation of Speech (Chicago 2018). A forthcoming book is Purchasing Submission: Conditions, Power, and Freedom (Harvard 2021).
He is a member of the American Academy of Arts and Sciences, and he has served on the board of directors of the American Society for Legal History. He has twice received the Sutherland Prize for the most significant contribution to English legal history, and has been awarded the Henry Paolucci - Walter Bagehot Book Award, the Hayek Book Prize, and the Bradley Prize.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
Deputy Secretary of Agriculture, U.S. Department of Agriculture
Judge Stephen Alexander Vaden was appointed as the Deputy Secretary of the U.S. Department of Agriculture on July 7, 2025. Alongside Secretary Brooke L. Rollins, Deputy Secretary Vaden leads the Department’s operations and implements policies that support America’s food and farm systems. A native of Union City, Tennessee, Deputy Secretary Vaden brings expertise in agricultural policy, law, and rural development. Previously, he served as a judge on the U.S. Court of International Trade and as General Counsel of USDA. Throughout Deputy Secretary Vaden’s time as General Counsel, he led successful Supreme Court litigation, advanced regulatory reform, and supported the implementation of the 2018 Farm Bill. He is a graduate of Yale Law School and Vanderbilt University. A public servant with strong agricultural roots, Deputy Secretary Vaden is committed to revitalizing rural America and ensuring an abundant, affordable, and safe U.S. food supply.
Senior Counsel, Caplin & Drysdale; Adjunct Professor of Law, Georgetown Law
Professor Carney is a Senior Counsel with Caplin & Drysdale, Cht’d. in Washington, D.C. He served as a Trial Attorney for the Tax Division of the U.S. Department of Justice for six years, and was in private (law firm) tax practice for many years, specializing in IRS administrative practice, tax controversies (audit and IRS Appeals Office), and tax litigation. He also advised clients in a similar capacity as a partner in the National Tax Office of Ernst & Young LLP in Washington. He is a member of the District of Columbia bar, as well as the bars of the U.S. Tax Court, U.S. Court of Federal Claims, U.S. District Court for the District of Columbia, and the U.S. Courts of Appeals for the Federal Circuit, D.C Circuit, and Eleventh Circuit.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
Founder, Law Office of Eileen J. O'Connor PLLC
After nearly 30 years as a national tax specialist with the IRS and major accounting firms, Eileen J. O’Connor, now an attorney in private practice, was Assistant Attorney General for the Justice Department’s Tax Division for six years during the administration of President George W. Bush and a member of then-President-elect Trump’s Treasury Department Transition Team. She focuses on federal administrative and tax law.
Adjunct Professor of Law, American University's Washington College of Law and the University of Pennsylvania's Carey Law School
Mr. Rothenberg earned his B.A. (in Economics) from the University of Pennsylvania (1971), his J.D. from American University’s Washington College of Law (1975), and his LL.M. (in Taxation) from Georgetown University Law Center (1979). Mr. Rothenberg worked in the Justice Department’s Tax Division for his entire career, starting out as a line attorney in the Division’s Appellate Section (where he handled, among many others, the landmark Tufts and Diedrich cases, and more recently argued the Murphy and Cohen cases before the D.C. Circuit, the latter en banc). For the last 15 years of his tenure, until he retired in November 2019, Mr. Rothenberg was Chief of the Tax Division’s Appellate Section, overseeing a staff of approximately 50 attorneys and support personnel. Mr. Rothenberg is also an Adjunct Professor of Law at the American University’s Washington College of Law, where for more than 30 years he has taught courses in individual, corporate, and partnership income tax. His publications include an article on tax deficiency procedures in The Virginia Tax Review, later reprinted in abbreviated form in The Monthly Digest of Tax Articles, and a chapter in the ABA’s 2009 publication entitled Careers in Tax Law. He was profiled in the Winter 2010 issue of the ABA’s Section of Taxation NewsQuarterly, and he is also a frequent speaker/panel member at federal tax conferences.
Senior Counsel, Caplin & Drysdale; Adjunct Professor of Law, Georgetown Law
Professor Carney is a Senior Counsel with Caplin & Drysdale, Cht’d. in Washington, D.C. He served as a Trial Attorney for the Tax Division of the U.S. Department of Justice for six years, and was in private (law firm) tax practice for many years, specializing in IRS administrative practice, tax controversies (audit and IRS Appeals Office), and tax litigation. He also advised clients in a similar capacity as a partner in the National Tax Office of Ernst & Young LLP in Washington. He is a member of the District of Columbia bar, as well as the bars of the U.S. Tax Court, U.S. Court of Federal Claims, U.S. District Court for the District of Columbia, and the U.S. Courts of Appeals for the Federal Circuit, D.C Circuit, and Eleventh Circuit.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
Founder, Law Office of Eileen J. O'Connor PLLC
After nearly 30 years as a national tax specialist with the IRS and major accounting firms, Eileen J. O’Connor, now an attorney in private practice, was Assistant Attorney General for the Justice Department’s Tax Division for six years during the administration of President George W. Bush and a member of then-President-elect Trump’s Treasury Department Transition Team. She focuses on federal administrative and tax law.
Adjunct Professor of Law, American University's Washington College of Law and the University of Pennsylvania's Carey Law School
Mr. Rothenberg earned his B.A. (in Economics) from the University of Pennsylvania (1971), his J.D. from American University’s Washington College of Law (1975), and his LL.M. (in Taxation) from Georgetown University Law Center (1979). Mr. Rothenberg worked in the Justice Department’s Tax Division for his entire career, starting out as a line attorney in the Division’s Appellate Section (where he handled, among many others, the landmark Tufts and Diedrich cases, and more recently argued the Murphy and Cohen cases before the D.C. Circuit, the latter en banc). For the last 15 years of his tenure, until he retired in November 2019, Mr. Rothenberg was Chief of the Tax Division’s Appellate Section, overseeing a staff of approximately 50 attorneys and support personnel. Mr. Rothenberg is also an Adjunct Professor of Law at the American University’s Washington College of Law, where for more than 30 years he has taught courses in individual, corporate, and partnership income tax. His publications include an article on tax deficiency procedures in The Virginia Tax Review, later reprinted in abbreviated form in The Monthly Digest of Tax Articles, and a chapter in the ABA’s 2009 publication entitled Careers in Tax Law. He was profiled in the Winter 2010 issue of the ABA’s Section of Taxation NewsQuarterly, and he is also a frequent speaker/panel member at federal tax conferences.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
William R. Orthwein Distinguished Professor of Law, Washington University in St. Louis School of Law
Professor Ronald M. Levin is a nationally known scholar who specializes in administrative law and related public law issues. He is the co-author of a casebook on state and federal administrative law, now in its third edition, as well as a nutshell on administrative law and process, now in its fifth edition. Formerly the law school's associate dean, he has published numerous articles and book chapters on administrative law topics, including judicial review, rulemaking, and legislative reform of the regulatory process. He also has written about the law of legislation, lobbying, and legislative ethics. Among his professional affiliations, Professor Levin has chaired the ABA Section of Administrative Law and Regulatory Practice and served as the ABA's advisor to the drafting committee to revise the Model State Administrative Procedure Act. He also has chaired the Section on Administrative Law and the Section on Legislation of the Association of American Law Schools (AALS). Currently a public member of the Administrative Conference of the United States (ACUS), he previously served as a consultant to ACUS and to the Supreme Court of Indonesia. Before joining the law faculty, Professor Levin clerked for the Hon. John C. Godbold, U.S. Court of Appeals for the Fifth Circuit, and practiced for three years in Washington, D.C., with the firm of Sutherland, Asbill & Brennan.
Senior Litigation Counsel, New Civil Liberties Alliance
Mr. Vecchione is a Senior Litigation Counsel for the non-profit New Civil Liberties Alliance representing clients against the Administrative State. He was previously President and CEO of the non-profit Cause of Action Institute, also advancing the constitutional order. He practiced at a number of D.C. area firms, including the eponymous John J. Vecchione Law, PLLC. Mr. Vecchione focuses his practice on strategic litigation in the federal district and appellate courts, including the Supreme Court of the United States. He is an experienced trial and appellate advocate having tried cases and argued appeals across the country. He is a member of the bars of the State of New York, the District of Columbia, and the Commonwealth of Virginia, as well as the Supreme Court of the United States and many federal courts. His cases are reported in scores of published opinions. He has also published pieces advancing the freedom agenda and constitutional order in the Wall Street Journal, the Washington Times and many other forums. He lives in Virginia with his wife Rebecca, sons Tommy and Joe.
Samuel H. McCoy II Professor of Law, University of Virginia School of Law
John F. Duffy is the Samuel H. McCoy II Professor of Law and Class of 1966 Research Professor of Law at the University of Virginia School of Law, where he teaches administrative law, torts and intellectual property. Professor Duffy has published articles on a wide range of administrative law and regulatory issues in journals such as University of Chicago Law Review, Yale Law Journal, Stanford Law Review, Virginia Law Review, Columbia Law Review, Texas Law Review, Northwestern University Law Review, NYU Law Review, University of Pennsylvania Law Review and the Supreme Court Review. His 1998 article Administrative Common Law in Judicial Review, 77 Tex. L. Rev. 113 (1998), was one of the first articles to criticize the Chevron doctrine as being irreconcilable with § 706 of the APA; it won the American Bar Association’s Scholarship Award in Administrative Law. His 2008 article “Are Administrative Patent Judges Unconstitutional?” was covered on National Public Radio), in the New York Times (Adam Liptak, In One Flaw, Questions on Validity of 46 Judges, May 6, 2008), and in the Wall Street Journal (Dan Slater, Patently Unconstitutional, May 6, 2008). The NYT and WSJ agreed that he was “a different kind of law professor,” “one of the lucky few” whose “writings actually wind up changing the law.”
As an attorney in the courts, Duffy has twice successfully convinced the Supreme Court to overturn lower court doctrines that had been applied in many cases over decades but that were unanimously held to be irreconcilable with Supreme Court precedents. See TC Heartland v. Kraft Foods Group Brands, 581 U.S. 258 (2017); KSR v. Teleflex, 550 U.S. 398 (2007).
Prior to entering legal academics, Duffy clerked on the D.C. Circuit for Stephen Williams and on the Supreme Court for Antonin Scalia. While clerking, he became known as Justice Scalia’s “hapless law clerk,” who had been tasked with unearthing three-quarters of a century of legislative history that made “no difference” to the outcome in an otherwise forgettable case. See Conroy v. Aniskoff, 507 U.S. 511, 527-28 (1993) (Scalia, J., concurring in the judgment).
In earlier days, Duffy enjoyed being a professional blackjack player unwelcome in all Atlantic City casinos and a semi-professional road runner (best marathon time 2:24:33). He holds an A.B. in physics from Harvard and a J.D. from the University of Chicago.
Maurice and Hilda Friedman Professor of Law, Columbia Law School; CEO, New Civil Liberties Alliance
Philip Hamburger is the Maurice and Hilda Friedman Professor of Law at Columbia Law School, and Chief Executive Officer at the New Civil Liberties Alliance. Before coming to Columbia, he was the John P. Wilson Professor at the University of Chicago Law School.
He writes on constitutional law and its history—with particular emphasis on religious liberty, freedom of speech and the press, judicial office, administrative power, and unconstitutional conditions.
His books are Separation of Church and State (Harvard 2002), Law and Judicial Duty (Harvard 2008), Is Administrative Law Unlawful? (Chicago 2014), The Administrative Threat (Encounter 2017), and Liberal Suppression: Section 501(c)(3) and the Taxation of Speech (Chicago 2018). A forthcoming book is Purchasing Submission: Conditions, Power, and Freedom (Harvard 2021).
He is a member of the American Academy of Arts and Sciences, and he has served on the board of directors of the American Society for Legal History. He has twice received the Sutherland Prize for the most significant contribution to English legal history, and has been awarded the Henry Paolucci - Walter Bagehot Book Award, the Hayek Book Prize, and the Bradley Prize.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
Deputy Secretary of Agriculture, U.S. Department of Agriculture
Judge Stephen Alexander Vaden was appointed as the Deputy Secretary of the U.S. Department of Agriculture on July 7, 2025. Alongside Secretary Brooke L. Rollins, Deputy Secretary Vaden leads the Department’s operations and implements policies that support America’s food and farm systems. A native of Union City, Tennessee, Deputy Secretary Vaden brings expertise in agricultural policy, law, and rural development. Previously, he served as a judge on the U.S. Court of International Trade and as General Counsel of USDA. Throughout Deputy Secretary Vaden’s time as General Counsel, he led successful Supreme Court litigation, advanced regulatory reform, and supported the implementation of the 2018 Farm Bill. He is a graduate of Yale Law School and Vanderbilt University. A public servant with strong agricultural roots, Deputy Secretary Vaden is committed to revitalizing rural America and ensuring an abundant, affordable, and safe U.S. food supply.
Senior Counsel, Caplin & Drysdale; Adjunct Professor of Law, Georgetown Law
Professor Carney is a Senior Counsel with Caplin & Drysdale, Cht’d. in Washington, D.C. He served as a Trial Attorney for the Tax Division of the U.S. Department of Justice for six years, and was in private (law firm) tax practice for many years, specializing in IRS administrative practice, tax controversies (audit and IRS Appeals Office), and tax litigation. He also advised clients in a similar capacity as a partner in the National Tax Office of Ernst & Young LLP in Washington. He is a member of the District of Columbia bar, as well as the bars of the U.S. Tax Court, U.S. Court of Federal Claims, U.S. District Court for the District of Columbia, and the U.S. Courts of Appeals for the Federal Circuit, D.C Circuit, and Eleventh Circuit.
Associate Dean for Research and Intellectual Life, McKnight Presidential Professor in Law, Distinguished McKnight University Professor, Harlan Albert Rogers Professor in Law, Associate Director, Corporate Institute, University of Minnesota Law School
Professor Kristin E. Hickman is the McKnight Presidential Professor in Law, a Distinguished McKnight University Professor, and Harlan Albert Rogers Professor in Law at the University of Minnesota Law School. She also has taught at Harvard Law School and Northwestern University School of Law. Professor Hickman teaches and writes primarily in the areas of administrative law, tax administration, and statutory interpretation. Her articles on these topics have appeared in the Columbia Law Review, Cornell Law Review, Virginia Law Review, Duke Law Journal, and other publications. She also co-authors the Administrative Law Treatise with Richard J. Pierce, Jr., and a casebook on federal administrative law with Pierce and Christopher J. Walker. Her scholarly work has been cited several times in opinions of the United States Supreme Court as well as regularly in lower court judicial opinions and court briefs.
In 2018-19, Professor Hickman served as Special Adviser to the Administrator of the Office of Information and Regulatory Affairs in Washington, D.C. She presently serves as a Senior Fellow, and previously served as a public member and chair of the judicial review committee, for the Administrative Conference of the United States. She also is a Fellow of the American College of Tax Counsel.
Professor Hickman received her B.S. degree in business administration with a concentration in accounting and a secondary major in history from Trinity University in San Antonio, Texas. After practicing for several years as a certified public accountant, Professor Hickman earned her J.D. degree, magna cum laude, from Northwestern University School of Law, where she was awarded the Raoul Berger Prize and the Lowden Wigmore Prize for her scholarly writings. Following law school, Professor Hickman clerked for The Honorable David B. Sentelle of the United States Court of Appeals for the District of Columbia Circuit and practiced law as an associate with the Chicago office of Skadden, Arps, Slate, Meagher & Flom, concentrating on corporate and international tax transactions and matters.
Founder, Law Office of Eileen J. O'Connor PLLC
After nearly 30 years as a national tax specialist with the IRS and major accounting firms, Eileen J. O’Connor, now an attorney in private practice, was Assistant Attorney General for the Justice Department’s Tax Division for six years during the administration of President George W. Bush and a member of then-President-elect Trump’s Treasury Department Transition Team. She focuses on federal administrative and tax law.
Adjunct Professor of Law, American University's Washington College of Law and the University of Pennsylvania's Carey Law School
Mr. Rothenberg earned his B.A. (in Economics) from the University of Pennsylvania (1971), his J.D. from American University’s Washington College of Law (1975), and his LL.M. (in Taxation) from Georgetown University Law Center (1979). Mr. Rothenberg worked in the Justice Department’s Tax Division for his entire career, starting out as a line attorney in the Division’s Appellate Section (where he handled, among many others, the landmark Tufts and Diedrich cases, and more recently argued the Murphy and Cohen cases before the D.C. Circuit, the latter en banc). For the last 15 years of his tenure, until he retired in November 2019, Mr. Rothenberg was Chief of the Tax Division’s Appellate Section, overseeing a staff of approximately 50 attorneys and support personnel. Mr. Rothenberg is also an Adjunct Professor of Law at the American University’s Washington College of Law, where for more than 30 years he has taught courses in individual, corporate, and partnership income tax. His publications include an article on tax deficiency procedures in The Virginia Tax Review, later reprinted in abbreviated form in The Monthly Digest of Tax Articles, and a chapter in the ABA’s 2009 publication entitled Careers in Tax Law. He was profiled in the Winter 2010 issue of the ABA’s Section of Taxation NewsQuarterly, and he is also a frequent speaker/panel member at federal tax conferences.
Courthouse Steps Decision: Loper Bright & Relentless
Kristin E. Hickman, Ronald M. Levin, John J. Vecchione
Chevron v. NRDC (1984) and subsequent precedents held that courts should defer to agency interpretations...
Courthouse Steps Decision: Loper Bright & Relentless
Kristin E. Hickman, Ronald M. Levin, John J. Vecchione
Chevron v. NRDC (1984) and subsequent precedents held that courts should defer to agency interpretations...
Courthouse Steps Decision: Loper Bright & Relentless
Chevron Under Review: Courthouse Steps Preview: Loper Bright & Relentless
John F. Duffy, Philip A. Hamburger, Kristin E. Hickman, Stephen Alexander Vaden
Chevron v. NRDC (1984) and subsequent precedents held that courts should defer to agency interpretations...
Chevron Under Review: Courthouse Steps Preview: Loper Bright & Relentless
John F. Duffy, Philip A. Hamburger, Kristin E. Hickman, Stephen Alexander Vaden
Chevron v. NRDC (1984) and subsequent precedents held that courts should defer to agency interpretations...
Chevron Under Review: Courthouse Steps Preview: Loper Bright & Relentless
Are IRS Defenses Crumbling?
Robert T. Carney, Kristin E. Hickman, Eileen J. O'Connor, Gilbert Rothenberg
The continuous stream of regulations and other guidance the Internal Revenue Service (IRS) must publish...
Are IRS Defenses Crumbling?
Robert T. Carney, Kristin E. Hickman, Eileen J. O'Connor, Gilbert Rothenberg
The continuous stream of regulations and other guidance the Internal Revenue Service (IRS) must publish...
Are IRS Defenses Crumbling?
TeleforumTopics
Are IRS Defenses Crumbling?
Congress’s frequent, numerous, and complicated changes to the tax laws make the Internal Revenue Service's...