John Yoo is the Emanuel S. Heller Professor of Law at the University of California, Berkeley, and a visiting scholar at the American Enterprise Institute. As a Justice Department official, John Yoo advised the Bush administration on the wars in Afghanistan and Iraq. He served as general counsel of the U.S. Senate Judiciary Committee and as a law clerk to Justice Clarence Thomas of the U.S. Supreme Court and Judge Laurence Silberman of the U.S. Court of Appeals for the D.C. Circuit. Professor Yoo is the author of more than 75 law journal articles and a regular contributor to major American editorial pages. He is co-author (with Julian Ku) of Taming Globalization: International Law, the U.S. Constitution, and the New World Order (Oxford University Press, 2012).