Joshua Geltzer is a lawyer, legal scholar, and teacher. He is the founding Executive Director of the Institute for Constitutional Advocacy and Protection, and Visiting Professor of Law at Georgetown University Law Center. He is also an International Security Program Fellow at New America and an Executive Editor at Just Security.Previously, Geltzer was Senior Director for Counterterrorism at the National Security Council staff. Before that, he was Deputy Legal Advisor to the National Security Council and Counsel to the Assistant Attorney General for National Security at the U.S. Department of Justice. He also served as a law clerk to Justice Stephen Breyer of the U.S. Supreme Court and, before that, as a law clerk to Chief Judge Alex Kozinski of the Ninth Circuit Court of Appeals.Geltzer's book, "US Counter-Terrorism Strategy and al-Qaeda: Signalling and the Terrorist World-View," was published in 2009. His worh has appeared in The Atlantic, the Berkeley Journal of International Law, Defense One, Foreign Policy, the Journal of Constitutional Law, the New York Times, Parameters, Politico, Studies in Conflict & Terrorism, and the Washington Post. He has appeared on BBC, Bloomberg TV, CBS, CNN, C-SPAN, Fox News, MSNBC, and National Public Radio.Geltzer received his J.D. from Yale Law School, where he served as editor-in-chief of the Yale Law Journal, and his PhD in War Studies from King’s College London. He received his B.A. from the Woodrow Wilson School of Public and International Affairs at Princeton University.