Philip Hamburger is the Maurice and Hilda Friedman Professor of Law at Columbia Law School. He writes on constitutional law, including religious liberty, freedom of speech and the press, administrative power, and unconstitutional conditions. His previous books are Separation of Church and State (Harvard 2002), Law and Judicial Duty (Harvard 2008), and Is Administrative Law Unlawful? (Chicago 2014). He received a BA from Princeton and JD from Yale. He is a member of the American Academy of Arts and Sciences, and has been awarded the Sutherland Prize twice, the Henry Paolucci/Walter Bagehot Book Award, the Hayek Book Prize, and the Bradley Prize.