John Yoo is a professor of law at the Boalt Hall School of Law, University of California, Berkeley. From 2001 to 2003, he served as deputy assistant attorney general in the Office of Legal Counsel at the U.S. Department of Justice, where he worked on issues involving foreign affairs, national security and the separation of powers. He was a clerk for Justice Clarence Thomas of the U.S. Supreme Court. Yoo’s most recent book is War by Other Means: An Insider’s Account of the War on Terror. He is a graduate of Harvard University and Yale Law School, where he was articles editor of the law journal.