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.
Professor of Practice and Distinguished Scholar in Residence; Co-Director of the Legislative and Regulatory Process Clinic, New York University School of Law
Sally Katzen served in the Clinton administration as administrator of the Office of Information and Regulatory Affairs in the Office of Management and Budget (OMB), as deputy assistant to the president for economic policy and deputy director of the National Economic Council in the White House, and then as the deputy director for management at OMB. She served as the head of the Agency Review Group for the Obama/Biden transition with responsibility for the Executive Office of the President and all government-wide agencies. She has taught both undergraduates and at various law schools. She is a member of the American Law Institute and the National Academy of Public Administration, has served on multiple panels for the National Academy of Sciences, testified frequently before Congress, and is on the board of several non-profit organizations. Before joining the Clinton administration, Katzen was a partner in the Washington, DC, law firm of Wilmer, Cutler & Pickering, specializing in regulatory and legislative matters, while serving in leadership roles in the American Bar Association (including chair of the Section on Administrative Law and Regulatory Practice and as DC delegate to the ABA’s House of Delegates), as president of the Federal Communications Bar Association and as president of the Women’s Legal Defense Fund. She graduated from Smith College and the University of Michigan Law School, where she was the first woman editor-in-chief of the Law Review. She clerked for Judge J. Skelly Wright of the United States Court of Appeals for the District of Columbia Circuit and served in the Carter administration as the general counsel of the Council on Wage and Price Stability in the Executive Office of the President.
Judge, United States Court of Appeals, District of Columbia Circuit
Judge Rao was appointed to the United States Court of Appeals for the District of Columbia Circuit in March 2019. She graduated from Yale College in 1995 and the University of Chicago Law School in 1999. Following graduation, she served as a law clerk to Judge J. Harvie Wilkinson III of the U.S. Court of Appeals for the Fourth Circuit and, in the 2001 October Term, as law clerk to Justice Clarence Thomas of the U.S. Supreme Court. Between her clerkships, Judge Rao served as counsel for nominations and constitutional law to the U.S. Senate Committee on the Judiciary. In 2002, she joined the international arbitration group of Clifford Chance LLP in London, England. From 2005-2006, she served as Special Assistant and Associate White House Counsel to President George W. Bush. From 2006 to 2017, Judge Rao was a professor at the Antonin Scalia Law School at George Mason University, where she taught constitutional law, legislation and statutory interpretation, and the history and foundations of the administrative state. In 2014, she founded the Center for the Study of the Administrative State, a non-profit Center that promotes academic scholarship and public policy debates about administrative law. In July 2017, she was appointed to serve as the Administrator of the Office of Information and Regulatory Affairs in the Office of Management Budget. She served in this position until her appointment to the D.C. Circuit.
Sandra Day O'Connor Professor of Law & Professor of Government, William & Mary Law School
Neal Devins is the Sandra Day O’Connor Professor of Law and Professor of Government at the College of William and Mary. He is the author of several books and more than 100 articles and book chapters on courts, constitutional law, and law & politics. His books include The Company They Keep (Oxford 2019) (with Larry Baum), The Democratic Constitution (Oxford 2d ed. 2015) (with Louis Fisher), Political Dynamics of Constitutional Law (West 6th ed. 2019) (with Louis Fisher), and Shaping Constitutional Values: The Supreme Court, Elected Government, and the Abortion Dispute (Johns Hopkins University Press 1996). His articles have appeared in The Yale Law Journal, The Stanford Law Review, The Columbia Law Review, The Michigan Law Review, The California Law Review, The Virginia Law Review, The University of Pennsylvania Law Review, The University of Chicago Law Review, The New York University Law Review, and several other journals and magazines. Professor Devins is also the author of op-eds appearing in The Wall Street Journal, The New York Times, The Washington Post, The Los Angeles Times, Slate, and several other newspapers. He has testified before House and Senate committees on budget reform and the separation of powers. Professor Devins is a graduate of Georgetown University (A.B. 1978) and Vanderbilt Law School (J.D. 1982).
Professor of Law, Antonin Scalia Law School, George Mason University
Professor of Law Michael S. Greve joined the faculty of the Antonin Scalia Law School, George Mason University in fall 2012 after having served as John G. Searle Scholar at the American Enterprise Institute (AEI), where he specialized in constitutional law, courts, and business regulation and served as chairman of the Competitive Enterprise Institute. Prior to joining AEI, Greve was founder and co-director of the Center for Individual Rights, a public interest law firm specializing in constitutional litigation.
Greve has served previously as an adjunct professor at a number of universities, including Cornell and Johns Hopkins Universities, and has been a visiting professor at Boston College since 2004. He was awarded a PhD and an MA in government by Cornell University. Greve also earned a Diploma from the University of Hamburg in Germany.
A prolific writer, Greve is the author of nine books and a multitude of articles appearing in scholarly publications, as well as numerous editorials, short articles, and book reviews. He is a frequent speaker for professional and scholarly organizations and has made many appearances on radio and television.
In addition Greve has provided congressional and state legislative testimony, has lobbied and consulted in federal agency proceedings, and has provided litigation services and management in over 30 cases, including matters before the U.S. Supreme Court.
Senior Litigation Counsel, New Civil Liberties Alliance
Peggy Little, Senior Counsel at New Civil Liberties Alliance, a new public interest law firm challenging the administrative state founded in 2017 by Professor Philip Hamburger, has over three decades of experience as a trial and appellate litigator in complex, high-stakes regulatory, mass-tort, class-action, products liability, securities, commercial and civil rights litigation representing individuals and high-profile litigants including Fortune 50 companies, financial institutions, public companies, and universities in state and federal courts, including the United States Supreme Court.
Peggy is a graduate of Yale College and Yale Law School, where she was awarded the Potter Stewart Prize. She was a law clerk to the Hon. Ralph K. Winter on the U.S. Court of Appeals for the Second Circuit. Prior to starting her own trial and appellate law firm in 1997, where she was appellate consulting counsel to the New Haven firefighters in Ricci v.DeStefano, a landmark 2009 United States Supreme Court decision, Peggy was a partner at Tyler, Cooper & Alcorn in New Haven, Connecticut. From 2004 to early 2018, Peggy directed, part-time, the Federalist Society Pro Bono Center.
Peggy has participated in many national conferences and symposia addressing issues of current importance in constitutional law – specifically state and federal constitutional questions regarding the separation of powers and the first amendment – and regularly speaks, blogs and publishes on the topic of the unconstitutional exercise of governmental power. In May of 2017, she presented her paper, Pirates at the Parchment Gates, to a conference of state and federal judges at the Law and Economics Center at the Antonin Scalia Law School. Her work has been published by law reviews, legal publications, the Federalist Society, the Wall Street Journal, Law and Liberty and the Manhattan Institute.
Recent publications include: How the SEC silences its critics, The SEC should listen to Sen. Cotton, Lucia v. SEC, Opening Salvos in the Opioid Litigation Wars, Straight Dope on the Opioid Crisis
Professor of Law, University of Michigan Law School
Professor Nicholas Bagley teaches and writes in the areas of administrative law, regulatory theory, and health law. Prior to joining the Law School faculty, he was an attorney with the appellate staff in the Civil Division at the U.S. Department of Justice, where he argued a dozen cases before the U.S. Courts of Appeals and acted as lead counsel in many more. Professor Bagley also served as a law clerk to Justice John Paul Stevens of the U.S. Supreme Court and to the Hon. David S. Tatel of the U.S. Court of Appeals, District of Columbia Circuit. Professor Bagley holds a BA in English from Yale University and received his JD, summa cum laude, from New York University School of Law. Before entering law school, he joined Teach For America and taught eighth-grade English at a public school in South Bronx. Professor Bagley's work has appeared in the Harvard Law Review, the Columbia Law Review, the Georgetown Law Journal, the New England Journal of Medicine, and the Journal of Health Politics, Policy, and Law. In 2012, he was the recipient of the Law School's L. Hart Wright Award for Excellence in Teaching. He is a frequent contributor to The Incidental Economist, a prominent health policy blog.
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.
Judge, U.S. Court of Appeals for the Third Circuit
Hon. Jennifer Mascott served as Associate Professor of Law and Director of the Separation of Powers Institute at The Catholic University of America’s Columbus School of Law before her appointment to the federal bench. On July 16, 2025, President Donald J. Trump nominated her to the U.S. Court of Appeals for the Third Circuit (Delaware), and she was confirmed on October 9, 2025.
Prior to her confirmation, Judge Mascott wrote extensively in administrative and constitutional law, statutory interpretation, and the separation of powers. Her scholarship—published in leading journals including the Stanford Law Review, Notre Dame Law Review, and Supreme Court Review—was cited by the U.S. Supreme Court and multiple federal courts. She also contributed Supreme Court commentary for NBC Universal.
Before joining Catholic Law, she was an Assistant Professor and Co-Director of The C. Boyden Gray Center at George Mason University’s Antonin Scalia Law School. In 2022 she became co-author of Beermann, Cass & Diver’s Administrative Law: Cases and Materials (9th ed.). In 2023 she received the Justice Joseph Story Award for excellence in scholarship, teaching, and advancing the rule of law.
Judge Mascott also served as a Council Member of the ABA’s Administrative Law Section and as a Public Member of the Administrative Conference of the United States. She frequently testified before Congress on executive power, regulatory reform, and judicial jurisdiction, and participated in multiple Supreme Court confirmation hearings.
From 2019 to 2021, she took leave from academia to serve as Deputy Assistant Attorney General in the Department of Justice’s Office of Legal Counsel and later as Associate Deputy Attorney General, where she argued federal cases and assisted with Justice Amy Coney Barrett’s confirmation. Earlier in her career, she clerked for Justice Clarence Thomas and for then-Judge Brett M. Kavanaugh on the D.C. Circuit.
Judge Mascott earned her J.D. summa cum laude from the George Washington University Law School and her B.A. from the same institution.
William K. Townsend Professor of Law, Yale Law School
Nicholas R. Parrillo is Townsend Professor of Law at Yale, with a secondary appointment as Professor of History. His research and teaching focus on administrative law and government bureaucracy and extend to legal history, remedies, and legislation. He has received the ABA’s award for the year’s best scholarship in administrative law and the Law and Society Association’s Hurst Prize for the year’s best book in legal history.
Parrillo’s Yale Law Journal article finding new originalist evidence of broad congressional delegations to agencies was discussed in the Solicitor General’s winning brief in the Supreme Court’s latest nondelegation case and in the en banc 5th Circuit opinion in that case. His Harvard Law Review article on how the judiciary handles the federal government’s disobedience to court orders has been discussed in The Washington Post, The Wall Street Journal, and The New York Times. Parrillo also authored a study that provided the empirical basis for best practices adopted by the Administrative Conference of the United States (ACUS) on the federal government’s ubiquitous but controversial use of guidance documents. Peer scholars at Jotwell, in selecting the “best new scholarship” in law, selected each of these three publications (one of them twice). Parrillo’s most recent article, invited for GW’s annual administrative law issue, reveals and analyzes dramatic variation among industries in their willingness to sue their federal health-and-safety regulators.
Parrillo has testified before Congress, been quoted by the Supreme Court, is a senior fellow of ACUS, and has been an instructor at the New York Historical Society’s graduate institute and an invited speaker before the 2nd Circuit Judicial Conference, the U.S. Department of Justice (in 2019 and again in 2024), the ACLU’s national legal staff, and the Federalist Society’s national convention (two times). He is a recipient of the Law School’s annual teaching award.
Judge, United States Court of Appeals, District of Columbia Circuit
Judge Rao was appointed to the United States Court of Appeals for the District of Columbia Circuit in March 2019. She graduated from Yale College in 1995 and the University of Chicago Law School in 1999. Following graduation, she served as a law clerk to Judge J. Harvie Wilkinson III of the U.S. Court of Appeals for the Fourth Circuit and, in the 2001 October Term, as law clerk to Justice Clarence Thomas of the U.S. Supreme Court. Between her clerkships, Judge Rao served as counsel for nominations and constitutional law to the U.S. Senate Committee on the Judiciary. In 2002, she joined the international arbitration group of Clifford Chance LLP in London, England. From 2005-2006, she served as Special Assistant and Associate White House Counsel to President George W. Bush. From 2006 to 2017, Judge Rao was a professor at the Antonin Scalia Law School at George Mason University, where she taught constitutional law, legislation and statutory interpretation, and the history and foundations of the administrative state. In 2014, she founded the Center for the Study of the Administrative State, a non-profit Center that promotes academic scholarship and public policy debates about administrative law. In July 2017, she was appointed to serve as the Administrator of the Office of Information and Regulatory Affairs in the Office of Management Budget. She served in this position until her appointment to the D.C. Circuit.
Roberto is a 2018 graduate of the University of Chicago Law School.
President, Cass & Associates, PC
Ronald A. Cass is Dean Emeritus of Boston University School of Law (where he was Dean from 1990-2004), President of Cass & Associates, PC, former Vice-Chairman and Commissioner of the U.S. International Trade Commission, former faculty member at Boston University School of Law and the University of Virginia Law School, and Distinguished Senior Fellow at the C. Boyden Gray Center for the Study of the Administrative State. Dean Cass also sits as an arbitrator for commercial, international, and intellectual property rights disputes, and is a former United States member of the Panel of Conciliators of the International Centre for Settlement of Investment Disputes. He is a member of the Council of the Administrative Conference of the United States and has received seven presidential appointments, spanning Presidents Ronald Reagan to Donald J. Trump.
As a law professor, lecturer, and scholar, Dean Cass has been teaching and writing about a wide array of legal issues on topics such as administrative law and regulation, antitrust, constitutional law, communications, intellectual property, international trade, separation of powers, and legal process. He has published more than 160 scholarly books, chapters, articles, and papers, including a leading casebook on administrative law. Dean Cass has taught judges as well as students in schools of law, economics, business, and public policy and has held academic appointments in the United States, Europe, and Latin America.
In addition to his academic work, Dean Cass has participated in numerous important legal cases as an amicus, consultant, or expert, and has advised businesses, law firms, investment funds, and government agencies on a range of trade, antitrust, intellectual property, and regulatory issues. He has a broad range of affiliations with professional groups, and has received numerous honors, fellowships and awards.
Dean Cass is a graduate of the University of Virginia and the University of Chicago Law School.
Mike Jayne is an attorney for the U.S. Department of Education. Previously, he worked for the Mercatus Center at George Mason University.
Luncheon Address & Panel: Administrative State on the Brink?
Tenth Annual Executive Branch Review
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Yet Another Federal Court Rules Against the CDC Eviction Moratorium
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Negative Legislation
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Note from the Editor: The Federalist Society takes no positions on particular legal and public...