President, Becket Fund for Religious Liberty; Professor of Law and Co-Director of the Center for Religious Liberty, Catholic University; Visiting Professor, Harvard Law School
Mark joined the Becket team in 2011 and splits his time as Associate Professor at The Catholic University of America, Columbus School of Law, and as Visiting Professor at Harvard Law School. Mark teaches constitutional law, religious liberty, torts, and evidence. He has been voted Teacher of the Year three years in a row by the Law School’s Student Bar Association.
Mark has broad experience litigating First Amendment religious exercise and free speech cases. He has represented the winning parties in a variety of Supreme Court First Amendment cases including Hobby Lobby, Little Sisters, Wheaton College, and Holt. In January 2014, Mark argued before the Supreme Court in McCullen v. Coakley, a First Amendment challenge to a Massachusetts speech restriction outside of abortion clinics. The Justices ruled in favor of his clients 9-0. Mark also led a successful eight-year litigation battle against Governor Blagojevich’s effort to force religious pharmacists to distribute the morning-after and week-after pills.
Mark’s academic writing focuses on the First and Fourteenth Amendments, and has appeared in a variety of prestigious journals, including the Harvard Law Review.
Mark is a widely sought after speaker on constitutional issues, particularly concerning abortion and the First Amendment. Professor Rienzi has been invited to discuss these issues at Harvard Law School, Columbia University Law School, Georgetown University Law Center, Boston College Law School, Notre Dame Law School, the National Press Club, and the Capitol. He has been quoted on constitutional law issues on NPR, in the Washington Times, The New York Daily News, and the Chicago Sun-Times. Mark has also been featured on the Kelly File, Fox News Sunday, Your World with Neil Cavuto, Geraldo at Large, CNN Tonight, CNN Live, Andrea Mitchell Reports, and Wall Street Journal Live.
Prior to joining Becket, Mark served as counsel for the litigation department and the intellectual property litigation practice group of WilmerHale LLP. His practice focused on complex civil and appellate litigation with a particular emphasis on intellectual property and First Amendment issues. Prior to joining WilmerHale, he served as law clerk to the Hon. Stephen F. Williams, senior circuit judge for the U.S. Court of Appeals for the D.C. Circuit. Prior to that, Mark was an editor of the Harvard Law Review, and earned his J.D. from Harvard Law School and B.A. from Princeton University, both with honors.
Vice President and Legal Director, National Right to Work Legal Defense and Education Foundation, Inc.
William Messenger is Foundation Vice President and Legal Director. He was a staff attorney for over twenty years and, during that time, represented individuals in numerous cases that sought to expand worker freedom of choice. This includes acting as lead counsel in three cases before the United States Supreme Court. In 2018, Messenger argued Janus v. AFSCME Council 31, where the Supreme Court held it violates the First Amendment for governments and unions to compel individuals to financially support unions and their speech. Originally from Youngstown Ohio, Messenger attended Ohio University as an undergraduate and then the George Washington University School of Law.
Senior Fellow and Director of Constitutional Studies, Manhattan Institute
Ilya Shapiro is a senior fellow and director of constitutional studies at the Manhattan Institute and a contributing editor of City Journal. Previously he was executive director and senior lecturer at the Georgetown Center for the Constitution, and before that a vice president of the Cato Institute.
Shapiro is the author of Lawless: The Miseducation of America’s Elites (2025) and Supreme Disorder: Judicial Nominations and the Politics of America’s Highest Court (2020), coauthor of Religious Liberties for Corporations? (2014), and editor of 11 volumes of the Cato Supreme Court Review (2008-18). He has contributed to a variety of academic, popular, and professional publications, including the Wall Street Journal, Harvard Journal of Law & Public Policy, Washington Post, Los Angeles Times, USA Today, National Review, and Newsweek. He also regularly provides commentary for various media outlets, writes the Shapiro’s Gavel newsletter on Substack, and once appeared on the Colbert Report.
Shapiro has testified many times before Congress and state legislatures and has filed more than 500 amicus curiae “friend of the court” briefs in the Supreme Court. He lectures regularly on behalf of the Federalist Society, is a member of the board of fellows of the Jewish Policy Center, was an inaugural Washington Fellow at the National Review Institute, and has been an adjunct law professor at the George Washington University and University of Mississippi. He is also the chairman of the board of advisers of the Mississippi Justice Institute, a barrister in the Edward Coke Appellate Inn of Court, and a former member of the Virginia Advisory Committee to the U.S. Commission on Civil Rights.
Earlier in his career, Shapiro was a special assistant/adviser to the Multi-National Force in Iraq on rule-of-law issues and practiced at Patton Boggs and Cleary Gottlieb. Before entering private practice, he clerked for Judge E. Grady Jolly of the U.S. Court of Appeals for the Fifth Circuit. He holds an AB from Princeton University, an MSc from the London School of Economics, and a JD from the University of Chicago Law School.
Partner, Bracewell LLP
Jeffrey Holmstead, former assistant administrator of the United States Environmental Protection Agency for Air and Radiation, is one of the nation’s leading climate change lawyers as recognized by Chambers USA (2008-2016) and heads the environmental strategies group (ESG) at Bracewell. The ESG is a multi-disciplinary group that includes environmental and energy attorneys, public policy advocates and strategic communications experts – most of whom have had high-level government experience. Under Jeffrey’s leadership, they work together on a daily basis to advise and defend companies and business groups confronting major environmental and energy-development challenges, both domestically and globally.
From his time in both the government and the private sector, Jeffrey is very familiar with the environmental and energy challenges facing the business community. He advises clients dealing with an increasingly complex regulatory, legal and public relations landscape, drawing on his experience in policy development, administrative and legislative advocacy, litigation and strategic communications. He has worked with clients in a number of industries on issues related to climate change, Clean Air Act policy and enforcement, and energy policy — including the development of new coal-fired power plants, refineries, renewable energy sources, and electric transmission infrastructure.
Jeffrey headed the EPA’s Office of Air and Radiation from 2001 to 2005, longer than anyone in EPA history. During his tenure, he was the architect of several of the agency’s most important initiatives, including the Clean Air Interstate Rule, the Clean Air Diesel Rule, the Mercury Rule for power plants and the reform of the New Source Review program. He also oversaw the development of the Bush Administration’s Clear Skies Legislation and key parts of its Global Climate Change Initiative. Between 1989 and 1993, Jeffrey served on the White House Staff as Associate Counsel to former President George H.W. Bush. In that capacity, he was involved in the passage of the Clean Air Act Amendments of 1990 and the key steps taken to implement those amendments. From 1987 to 1988, he served as a law clerk to Judge Douglas H. Ginsburg on the U.S. Court of Appeals for the District of Columbia.
He received his B.A. from Brigham Young University, summa cum laude, and his J.D. from Yale Law School.
Executive Director, State and Local Legal Center
Lisa Soronen is the Executive Director of the SLLC. Prior to joining the SLLC, Lisa worked for the National School Boards Association, the Wisconsin Association of School Boards, and clerked for the Wisconsin Court of Appeals. She earned her J.D. at the University of Wisconsin Law School and is a graduate of Central Michigan University.
Chief Financial Officer, Mercatus Center at George Mason University
Gary Leff is the chief financial officer at the Mercatus Center at George Mason University.
Previously he was the director of development for Mercatus, and prior to that the program director for the Institute for Humane Studies Liberty & Society summer seminars.
He has assisted several market-oriented organizations with their fundraising programs, having written direct mail prospecting letters for them under the signatures of Dick Armey, Tom DeLay, Bill Archer, Paul Ryan, and others.
He has been cited in numerous publications including the New York Times, Wall Street Journal, Financial Times, San Francisco Chronicle, Washington Post and his favorite, Austin Womanmagazine.
Mr. Leff first came to Washington as a Charles G. Koch Summer Fellow at the Tax Foundation where he co-authored (with Arthur P. Hall) the excitingly-titled "A Half Century of Small Business Federal Income Tax Rates and Collections."
A renowned expert on airline, hotel, and credit card loyalty programs, Mr. Leff served as senior moderator and member-elected board president of Flyertalk.com, the world’s most popular online travel community. He was named one of five voices to listen to on business travel by Inside Flyer magazine, and one of five travel experts to follow on Twitter by Conde’ Nast Travel. The launch of his blog in 2008 at BoardingArea.com was covered in the New York Times and International Herald Tribune, and its influence over the travel industry has been noted in multiple stories by the New York Times and Washington Times.
Vice President and Legal Director, National Right to Work Legal Defense and Education Foundation, Inc.
William Messenger is Foundation Vice President and Legal Director. He was a staff attorney for over twenty years and, during that time, represented individuals in numerous cases that sought to expand worker freedom of choice. This includes acting as lead counsel in three cases before the United States Supreme Court. In 2018, Messenger argued Janus v. AFSCME Council 31, where the Supreme Court held it violates the First Amendment for governments and unions to compel individuals to financially support unions and their speech. Originally from Youngstown Ohio, Messenger attended Ohio University as an undergraduate and then the George Washington University School of Law.
Senior Fellow and Director of Constitutional Studies, Manhattan Institute
Ilya Shapiro is a senior fellow and director of constitutional studies at the Manhattan Institute and a contributing editor of City Journal. Previously he was executive director and senior lecturer at the Georgetown Center for the Constitution, and before that a vice president of the Cato Institute.
Shapiro is the author of Lawless: The Miseducation of America’s Elites (2025) and Supreme Disorder: Judicial Nominations and the Politics of America’s Highest Court (2020), coauthor of Religious Liberties for Corporations? (2014), and editor of 11 volumes of the Cato Supreme Court Review (2008-18). He has contributed to a variety of academic, popular, and professional publications, including the Wall Street Journal, Harvard Journal of Law & Public Policy, Washington Post, Los Angeles Times, USA Today, National Review, and Newsweek. He also regularly provides commentary for various media outlets, writes the Shapiro’s Gavel newsletter on Substack, and once appeared on the Colbert Report.
Shapiro has testified many times before Congress and state legislatures and has filed more than 500 amicus curiae “friend of the court” briefs in the Supreme Court. He lectures regularly on behalf of the Federalist Society, is a member of the board of fellows of the Jewish Policy Center, was an inaugural Washington Fellow at the National Review Institute, and has been an adjunct law professor at the George Washington University and University of Mississippi. He is also the chairman of the board of advisers of the Mississippi Justice Institute, a barrister in the Edward Coke Appellate Inn of Court, and a former member of the Virginia Advisory Committee to the U.S. Commission on Civil Rights.
Earlier in his career, Shapiro was a special assistant/adviser to the Multi-National Force in Iraq on rule-of-law issues and practiced at Patton Boggs and Cleary Gottlieb. Before entering private practice, he clerked for Judge E. Grady Jolly of the U.S. Court of Appeals for the Fifth Circuit. He holds an AB from Princeton University, an MSc from the London School of Economics, and a JD from the University of Chicago Law School.
Distinguished Senior Fellow and Antonin Scalia Chair in Constitutional Studies, Ethics and Public Policy Center
Edward Whelan is a Distinguished Senior Fellow of the Ethics and Public Policy Center and holds EPPC’s Antonin Scalia Chair in Constitutional Studies. He is the longest-serving President in EPPC’s history, having held that position from March 2004 through January 2021.
Mr. Whelan directs EPPC’s program on The Constitution, the Courts, and the Culture. His areas of expertise include constitutional law and the judicial confirmation process. As a contributor to National Review Online’s Bench Memos blog, he has been a leading commentator on nominations to the Supreme Court and the lower courts and on issues of constitutional law. He has written essays and op-eds for leading newspapers—including the Wall Street Journal, the New York Times, and the Washington Post—opinion journals, and academic symposia and law reviews. The National Law Journal has named Mr. Whelan among its “Champions and Visionaries” in the practice of law in D.C.
Mr. Whelan is co-editor of three volumes of Supreme Court Justice Antonin Scalia’s work: Scalia Speaks: Reflections on Law, Faith, and Life Well Lived (Crown Forum, 2017), a New York Times bestselling collection of speeches by Justice Scalia; On Faith: Lessons from an American Believer (Crown Forum, 2019), a collection of Justice Scalia’s writings on faith and religion; and The Essential Scalia: On the Constitution, the Courts, and the Rule of Law (Crown Forum, 2020), a collection of Justice Scalia’s views on legal issues.
Mr. Whelan, a lawyer and a former law clerk to Justice Scalia, has served in positions of responsibility in all three branches of the federal government. From just before the terrorist attacks of September 11, 2001, until joining EPPC in 2004, Mr. Whelan was the Principal Deputy Assistant Attorney General for the Office of Legal Counsel in the U.S. Department of Justice. In that capacity, he advised the White House Counsel’s Office, the Attorney General and other senior DOJ officials, and departments and agencies throughout the executive branch on difficult and sensitive legal questions. Mr. Whelan previously served on Capitol Hill as General Counsel to the U.S. Senate Committee on the Judiciary. In addition to clerking for Justice Scalia, he was a law clerk to Judge J. Clifford Wallace of the U.S. Court of Appeals for the Ninth Circuit.
In 1981 Mr. Whelan graduated with honors from Harvard College and was inducted into Phi Beta Kappa. He received his J.D. magna cum laude in 1985 from Harvard Law School, where he was a member of the Board of Editors of the Harvard Law Review.
For more on Mr. Whelan’s background, see this interview.
Partner, Graves Garrett Greim LLC
Edward “Eddie” Greim focuses his practice on complex commercial litigation, free speech and election law, and internal investigations and whistleblower claims. He has been recognized for his successful representation of businesses and individuals in commercial litigation while also being named a “go-to” lawyer on policy and constitutional issues.
Eddie was named a Constitutional and Election Law Trailblazer by the National Law Journal in 2020. His free speech and election law practice has included numerous constitutional challenges to election and campaign finance laws; representation of clients in state and federal ethics and campaign finance enforcement actions and investigations; initiative petition drafting and litigation; litigation and advice regarding First Amendment protections for petition circulation; representation of not-for-profit clients before state regulators; litigation of state and federal redistricting issues; and advice on campaign and election law compliance.
Eddie complements his trial work in complex, high-profile commercial and constitutional cases with oral advocacy and briefing in important appeals. Recognized as a Missouri Lawyers Media POWER 30 Appellate Attorney in 2021, he has argued before the Missouri and Kansas supreme courts multiple times, other state appellate courts across the country, and before the Sixth, Seventh, Eighth, and Tenth U.S. Courts of Appeals.
Eddie’s notable work for clients includes:
Recovering substantial compensation and injunctive relief for plaintiffs, in complex multiyear litigation, as lead counsel in the first and only nationwide class action certified against the Internal Revenue Service for violating taxpayer protection statutes when it targeted hundreds of groups based on their political viewpoints.
Successful First Amendment challenge to Missouri’s 2016 campaign finance restrictions.
Successful challenge to a vast, multiyear, secret criminal investigation into Wisconsin political groups and nonprofits, and follow-up challenge to expose role of state ethics board which secretly aided the investigation and was later dissolved by the legislature.
U.S. Supreme Court amicus brief for the National Republican Redistricting Trust in the 2019 Rucho litigation, and federal and state redistricting litigation and advice since 2011.
Challenges under the First Amendment in federal court, and in briefing to the Michigan Supreme Court on state constitutional grounds, to unprecedented emergency powers claimed by Michigan Governor in 2020.
Representation of numerous public officials and private citizens who are subject to “lawfare” attacks based on their political viewpoints or policy objectives.
Oversight of multiple internal investigations.
Eddie received his law degree from Harvard Law School in 2002, where he taught on the Board of Student Advisers, received the Dean’s Award for Leadership, and served as President of the Harvard Catholic Law Students Association. He received two bachelor’s degrees, summa cum laude, in economics and political science from the University of Missouri.
A native of Excelsior Springs, Missouri, Eddie lives in Kansas City with his family. He enjoys Missouri and military history. On many weekends, he can be found with his wife and daughters exploring sites of local interest. He enjoys reading and debating and has given presentations or organized discussions at numerous gatherings, formal and informal, of professional and personal interest.
Distinguished Senior Fellow and Antonin Scalia Chair in Constitutional Studies, Ethics and Public Policy Center
Edward Whelan is a Distinguished Senior Fellow of the Ethics and Public Policy Center and holds EPPC’s Antonin Scalia Chair in Constitutional Studies. He is the longest-serving President in EPPC’s history, having held that position from March 2004 through January 2021.
Mr. Whelan directs EPPC’s program on The Constitution, the Courts, and the Culture. His areas of expertise include constitutional law and the judicial confirmation process. As a contributor to National Review Online’s Bench Memos blog, he has been a leading commentator on nominations to the Supreme Court and the lower courts and on issues of constitutional law. He has written essays and op-eds for leading newspapers—including the Wall Street Journal, the New York Times, and the Washington Post—opinion journals, and academic symposia and law reviews. The National Law Journal has named Mr. Whelan among its “Champions and Visionaries” in the practice of law in D.C.
Mr. Whelan is co-editor of three volumes of Supreme Court Justice Antonin Scalia’s work: Scalia Speaks: Reflections on Law, Faith, and Life Well Lived (Crown Forum, 2017), a New York Times bestselling collection of speeches by Justice Scalia; On Faith: Lessons from an American Believer (Crown Forum, 2019), a collection of Justice Scalia’s writings on faith and religion; and The Essential Scalia: On the Constitution, the Courts, and the Rule of Law (Crown Forum, 2020), a collection of Justice Scalia’s views on legal issues.
Mr. Whelan, a lawyer and a former law clerk to Justice Scalia, has served in positions of responsibility in all three branches of the federal government. From just before the terrorist attacks of September 11, 2001, until joining EPPC in 2004, Mr. Whelan was the Principal Deputy Assistant Attorney General for the Office of Legal Counsel in the U.S. Department of Justice. In that capacity, he advised the White House Counsel’s Office, the Attorney General and other senior DOJ officials, and departments and agencies throughout the executive branch on difficult and sensitive legal questions. Mr. Whelan previously served on Capitol Hill as General Counsel to the U.S. Senate Committee on the Judiciary. In addition to clerking for Justice Scalia, he was a law clerk to Judge J. Clifford Wallace of the U.S. Court of Appeals for the Ninth Circuit.
In 1981 Mr. Whelan graduated with honors from Harvard College and was inducted into Phi Beta Kappa. He received his J.D. magna cum laude in 1985 from Harvard Law School, where he was a member of the Board of Editors of the Harvard Law Review.
For more on Mr. Whelan’s background, see this interview.
The Administrative State and Religious Freedom
Mark L. Rienzi
Why is there so much conflict between the administrative state and religion? Mark Rienzi, professor...
Preview: Janus v. American Federation of State, County, and Municipal Employees
William L. Messenger, Ilya Shapiro
Janus v. American Federation of State, County, and Municipal Employees is scheduled for oral argument...
Introduction to the Energy & Environment Working Group
Jeffrey Holmstead
Jeffrey Holmstead is the Chairman of RTP's Energy & Environment working group and Partner, Bracewell...
Preview: Janus v. American Federation of State, County, and Municipal Employees
Labor & Employment Law Practice Group Teleforum
TeleforumScalia Speaks: Reflections on Law, Faith, and Life Well Lived
Atlanta, GALunch with Judge Gregory F. Van Tatenhove
Lexington, KYCity of Hays, Kansas v. Vogt: The Limits of Self-Incrimination [SCOTUSbrief]
Lisa Soronen
What are the limits of self-incrimination under the Constitution? Lisa Soronen, Executive Director of the...
New Developments in Wisconsin’s John Doe Investigations
Free Speech & Election Law Practice Group
TeleforumAuthor and Justice Scalia Law Clerk Ed Whelan Visits the SD Federalist Society
San Diego Lawyers Chapter
San Diego, CAAirline Law and Regulation: A Brief History [POLICYbrief]
Gary Leff
Why is the airline industry one of the most heavily regulated and subsidized industries in...