Randy Evan Barnett (born February 5, 1952) is an American legal scholar. He serves as the Patrick Hotung Professor of Constitutional Law at Georgetown University, where he teaches constitutional law and contracts, and is the director of the Georgetown Center for the Constitution. After graduating from Northwestern University and Harvard Law School, Barnett tried felony cases as a prosecutor in the Cook County State's Attorney's Office in Chicago. A recipient of a Guggenheim Fellowship in Constitutional Studies and the Bradley Prize, Barnett has been a visiting professor at Penn, Northwestern and Harvard Law School. In 2004, Barnett argued the medical marijuana case of Gonzalez v. Raich before the U.S. Supreme Court. In 2012, he was one of the lawyers representing the National Federation of Independent Business in its constitutional challenge to the Affordable Care Act in NFIB v. Sebelius. He blogs on the Volokh Conspiracy.