Jenn L. Mascott

Judge, U.S. Court of Appeals for the Third Circuit

Biography

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.

Michael McGinley

Partner, Dechert LLP

Biography

Michael H. McGinley, Global Co-Chair of the Securities and Complex Litigation practice group at Dechert, focuses his practice on high-stakes litigation, specifically appellate and complex commercial matters. Mr. McGinley has experience representing clients at every level of the federal judiciary, as well as in numerous federal agencies and state courts. In early 2025, he argued three cases before the United States Supreme Court in a span of four months.

He has litigated a wide range of issues, including federal jurisdiction, Chevron deference, federalism, preemption, antitrust, arbitration, labor law, tort law, antidumping and trade-remedy disputes, securities and corporate law, contract rights, voting rights, free speech, religious freedom and many other constitutional issues. Mr. McGinley also regularly advises individual, corporate and government clients on strategic, criminal defense, and regulatory matters.

Prior to joining Dechert, Mr. McGinley served as Associate Counsel and Special Assistant to the President in the White House Counsel's Office, where his primary responsibilities included the review of major legislative and regulatory actions and the confirmation of judicial nominees, including Justice Gorsuch. During his time in the White House, Mr. McGinley worked closely with the Department of Justice, the Office of Management and Budget, a number of federal agencies, and various congressional committees. He also previously served as a law clerk to Justice Samuel A. Alito, Jr. of the Supreme Court of the United States and to then-Judge Neil M. Gorsuch, of the United States Court of Appeals for the Tenth Circuit.

Mr. McGinley has been ranked by Chambers USA in Band 1 for appellate litigation in Pennsylvania and recognized by The Legal 500 for his expertise in financial services litigation, general commercial disputes, and international litigation. He was named an “Appellate MVP of the Year” for 2025 by Law360, and his appellate victories helped earn Dechert a place on the National Law Journal’s “Appellate Hot List” in 2025. Mr. McGinley is named among the Financial Times’ Top 10 “Most Innovative Legal Practitioners in North America” as part of the FT’s Innovative Lawyers Awards 2025 for North America.

Mr. McGinley is an elected member of the American Law Institute. He was appointed by the President to the governing Council of the Administrative Conference of the United States, which is an independent agency charged with convening experts from the public and private sectors to recommend improvements to administrative process and procedure. He also serves as the Co-Chair of the American Bar Association’s Administrative Rulemaking Committee.

Robert E. Johnson

Senior Attorney, Institute for Justice

Biography

Rob Johnson is a senior attorney at the Institute for Justice, where he litigates to protect private property, free speech, and other individual rights. Rob is a nationally-recognized expert on civil forfeiture. He previously represented a series of small business owners who had their entire bank accounts seized by the IRS, and he launched an initiative that resulted in the IRS reopening hundreds of closed forfeiture cases and returning millions of dollars. He has also litigated cases challenging the constitutionality of civil forfeiture procedures, and he scored a victory striking down a forfeiture program as a violation of due process.

Beyond civil forfeiture, Rob has litigated cases defending a range of constitutional rights. He was part of teams that successfully challenged occupational licensing requirements for tour guides in Savannah and Charleston. He also developed a class action lawsuit fighting the NYPD’s use of a draconian “no-fault eviction” statute to coerce residents to waive their constitutional rights, which led New York City to reform the challenged law.

Rob’s writing has been published in the Wall Street Journal, Washington Post, Politico, and Reason, among other venues. Rob has testified about occupational licensing before the House and Senate Judiciary Committees and has twice testified about civil forfeiture before the House Ways & Means Oversight Subcommittee. He has also testified before state legislatures across the country.

From 2014-2017, Rob served as IJ’s first Elfie Gallun Fellow for Freedom and the Constitution. In that role, Rob wrote and spoke about the vital role the U.S. Constitution plays in protecting our most precious freedoms. He is currently at work on a book about the Fourteenth Amendment.

Rob studied literature and anthropology at Columbia University, and he studied law at Harvard Law School. Upon graduation, he clerked for Chief Judge Alex Kozinski on the Ninth Circuit and for Justice Anthony Kennedy on the Supreme Court.

Rob lives in Cleveland with his wife and two daughters—all named after characters in Shakespeare plays—and is an amateur large format photographer.

Jenn L. Mascott

Judge, U.S. Court of Appeals for the Third Circuit

Biography

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.

Jenn L. Mascott

Judge, U.S. Court of Appeals for the Third Circuit

Biography

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.

Aaron Nielson

Charles I. Francis Professorship in Law, University of Texas at Austin School of Law

Biography

Professor Aaron Nielson lectures and writes in the areas of administrative law, civil procedure, and federal courts. Before joining the faculty, he served as Solicitor General of Texas and represented Texas before the U.S. Supreme Court and the Texas Supreme Court, as well as overseeing all appellate litigation for the State. Earlier in his career, he was a professor at Brigham Young University and an appellate and antitrust partner in the Washington, D.C. office of Kirkland & Ellis LLP. He also clerked for Justice Samuel A. Alito, Jr. of the U.S. Supreme Court, Judge Janice Rogers Brown of the U.S. Court of Appeals for the D.C. Circuit, and Judge Jerry E. Smith of the U.S. Court of Appeals for the Fifth Circuit.

As Solicitor General, Professor Nielson successfully defended against a First Amendment challenge Texas’s law requiring online pornographers to institute age verification. In 2020, the U.S. Supreme Court appointed him to defend the constitutionality of a federal agency. He currently serves as a Senior Fellow of the Administrative Conference of the United States after completing a six-year term as an appointed public member and chair of the Conference’s Administration & Management Committee.

Nielson’s research focuses on administrative law, federal litigation, and the separation of powers. He has published (or soon will publish) in the Harvard Law Review, Columbia Law Review, University of Chicago Law Review, University of Pennsylvania Law Review, Duke Law Journal, Georgetown Law Journal, Cornell Law Review, and Northwestern University Law Review, among others. Nielson has been recognized for teaching for teaching and scholarship and in 2021 received the Federalist Society’s Joseph Story Award, which recognizes a young academic for excellence in legal scholarship, a commitment to teaching, and a concern for students, and who has made a significant public impact in a manner that advances the rule of law in a free society. He is also an elected member of the American Law Institute.

Professor Nielson received his J.D. magna cum laude from Harvard Law School and an LL.M from the University of Cambridge, where he focused his studies on the institutions that regulate global competition and commerce. He received his undergraduate degree summa cum laude from the University of Pennsylvania, majoring in economics and political science.

Chad A. Readler

Judge, United States Court of Appeals, Sixth Circuit

Biography

Judge Readler earned his undergraduate and law degrees from the University of Michigan. After graduating, he served as a law clerk to Judge Alan Norris of the United States Court of Appeals for the Sixth Circuit. Judge Readler then began practicing law in the Columbus office of the international law firm Jones Day, eventually spending ten years as a partner in the firm’s Issues and Appeals Practice Group. While at Jones Day, Judge Readler appeared in state and federal trial and appellate courts around the country, most frequently the Supreme Court of Ohio and the Sixth Circuit. Judge Readler also successfully argued before the United States Supreme Court in McQuiggin v. Perkins on behalf of an inmate claiming actual innocence. His other pro bono representations include representing capital defendants before the Tenth Circuit and the Supreme Court of Ohio, as well as representing defendants sentenced to life in prison before the Sixth Circuit. While at Jones Day, Judge Readler traveled to Nairobi with Lawyers Without Borders to train Kenyan lawyers in prosecuting domestic violence cases, and he was also a recipient of the American Marshall Memorial Fellowship awarded by the German Marshall Fund of the United States. Following his career in private practice, Judge Readler served as Acting Assistant Attorney General for the Civil Division of the United States Department of Justice from 2017 to 2019. In that role, Judge Readler led and supervised over 1,000 lawyers in the Department’s largest litigating division, briefing and arguing several cases on behalf of the United States in federal courts across the country, including high-profile cases significant to the Administration and the Department.  In March 2019, Judge Readler was confirmed to serve as a Circuit Judge on the Sixth Circuit. He resides in Columbus.

Jenn L. Mascott

Judge, U.S. Court of Appeals for the Third Circuit

Biography

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.

Nicholas R. Parrillo

William K. Townsend Professor of Law, Yale Law School

Biography

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.

Roman Martinez

Partner, Latham & Watkins LLP

Biography

Roman Martinez is a partner in the Washington, D.C. office of Latham & Watkins. As a member of the firm’s Supreme Court and Appellate Practice, he focuses primarily on appeals in the Supreme Court of the United States, the United States Courts of Appeals, and state appellate courts. Mr. Martinez has handled civil and criminal matters involving a wide range of constitutional, statutory, and administrative law issues, and he has argued cases in the Supreme Court and the D.C., Sixth, Ninth, and Federal Circuits, among other courts.

Mr. Martinez’s appellate practice encompasses civil and criminal matters spanning virtually all areas of law. He recently rejoined Latham after serving as an Assistant to the Solicitor General at the US Department of Justice. In that role, he represented the United States in litigation before the Supreme Court and advised the Solicitor General on the government’s appellate litigation throughout the country.

Mr. Martinez has personally argued seven cases in the Supreme Court, including important cases in the fields of patent law, criminal law, civil rights, and civil procedure. He has filed over 75 briefs in the Supreme Court involving a wide range of legal issues, including administrative, tax, securities, intellectual property, criminal, environmental, education, civil rights, immigration, and First Amendment law.

Over the past year, Mr. Martinez has led Latham appellate teams in cases involving the Administrative Procedure Act, securities, ERISA, products liability, and employment law. Earlier this year, he successfully persuaded the Supreme Court to reject the State of Connecticut’s high-profile effort to reinstate the murder conviction of Michael Skakel. He frequently consults with clients to develop creative approaches to difficult legal questions that arise in and out of litigation.

Mr. Martinez’s extensive pro bono practice focuses chiefly on administrative law challenges to unlawful agency action by the Department of Veterans Affairs, as well as on criminal defense appeals. In 2018, he persuaded the Supreme Court to grant certiorari on behalf of a veteran seeking judicial review of an unlawful regulation promulgated by the Department of Veterans Affairs.

Before joining Latham, Mr. Martinez served as a law clerk to Chief Justice John G. Roberts of the Supreme Court of the United States and to then Judge Brett M. Kavanaugh of the D.C. Circuit.

From 2002 to 2005, Mr. Martinez served as an advisor on the Iraqi political and constitutional process, in various roles at the White House, at the US Embassy and Coalition Provisional Authority in Iraq, and at the Department of Defense. He received the Secretary of Defense Medal for the Global War on Terrorism and the US Department of Defense Distinguished Public Service Award for his service in Iraq.

Mr. Martinez is a member of the Edward Coke Appellate Inn of Court, and he serves on the US Chamber of Commerce's Administrative Law & Government Litigation Advisory Committee. He previously served as a member of the D.C. Circuit’s Advisory Committee on Procedures, and he now serves on the US District Court for the District of Columbia’s Committee on Grievances. His writing has appeared in The Wall Street Journal, The Washington Post, and other publications. He has appeared as a guest on the PBS NewsHour and other television programs to discuss the Supreme Court.

Jenn L. Mascott

Judge, U.S. Court of Appeals for the Third Circuit

Biography

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.