Mark Rienzi
President & CEO
Mark joined Becket in 2011 and has served as its President since 2018. He is also a Professor of Law at the Catholic University of America, Columbus School of Law, where he co-directs the Center for Religious Liberty, and he has served as a Visiting Professor of Law at Harvard Law School. He teaches constitutional law, religious liberty, and evidence, and has three times been voted Teacher of the Year.
With the team at Becket, Mark has litigated and won an uninterrupted string of important First Amendment cases at the U.S. Supreme Court including Hosanna-Tabor v. EEOC (2012), Little Sisters of the Poor (2013), McCullen v. Coakley (2014), Hobby Lobby (2014), Wheaton College (2014), Holt v. Hobbs (2015), Zubik v. Burwell (2016), Our Lady of Guadalupe (2020), Little Sisters of the Poor (2020), Diocese of Brooklyn/Agudath Israel (2020), Fulton v. Philadelphia (2021), CCB v. Wisconsin (2025), and Mahmoud v. Taylor (2025).
Mark’s scholarship has appeared in the Harvard Law Review, Stanford Law Review (online), and Notre Dame Law Review, among other publications. He has been quoted on religious liberty issues in a variety of outlets, including the New York Times, Wall Street Journal, Washington Post, and NPR, and has made appearances on Fox News Sunday, CNN Tonight, Wall Street Journal Live, and many other programs.
Prior to joining Becket, Mark served as counsel for WilmerHale LLP and a law clerk to the Hon. Stephen F. Williams of the U.S. Court of Appeals for the D.C. Circuit. He earned his J.D. from Harvard Law School and B.A. from Princeton University, both with honors.