John Yoois a professor of law at the University of California at Berkeley School of Law, where he has taught since 1993. From 2001-2003, he served as a deputy assistant attorney general in the Office of Legal Counsel of the U.S. Department of Justice, where he worked on issues involving foreign affairs, national security, and the separation of powers. He served as general counsel of the U.S. Senate Judiciary Committee from 1995-96, where he advised on constitutional issues and judicial nominations.Professor Yoo received his B.A., summa cum laude, in American history from Harvard University and his J.D. from Yale Law School. He was a visiting professor at the University of Chicago Law School in 2003 and at the Free University of Amsterdam in 1998. In 2006, Professor Yoo held the Distinguished Fulbright Chair in Law at the University of Trento (Italy).Professor Yoo has published many articles on foreign affairs, national security, and constitutional law. He is the author ofThe Powers of War and Peace: Foreign Affairs and the Constitution after 9/11(University of Chicago Press, 2005) andWar by Other Means: An Insider's Account of the War on Terror(Atlantic Monthly Press, 2006).Crisis and Commandcompletes his trilogy on the controversies provoked by the September 11th attacks of 2001.