Joshua Geltzer serves as the founding Executive Director of the Institute for Constitutional Advocacy and Protection as well as Visiting Professor of Law at Georgetown University Law Center. He is also an ASU Future of War Fellow at New America.

Geltzer served from 2015 to 2017 as Senior Director for Counterterrorism at the National Security Council staff, having served previously as Deputy Legal Advisor to the National Security Council and as 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 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, where he was a Marshall Scholar. Before that, he attended Princeton University, majoring in the Woodrow Wilson School of Public and International Affairs.

He is the author of US Counter-Terrorism Strategy and al-Qaeda: Signalling and the Terrorist World-View, published by Routledge; and his work has appeared in The Atlantic, Foreign Policy, Parameters, Politico, Studies in Conflict & Terrorism, the Journal of Constitutional Law, the Berkeley Journal of International Law, and the Washington Post.


U.S. Supreme Court Briefs

Brief of Amicus Curiae United States House of Representatives in Support of Respondents, Dep't of Commerce v. New York, No. 18-966 (U.S. Feb. 11, 2019).
Brief of Michael German, Robert Kobus, Jane Turner, Dr. Frederic Whitehurst, National Whistleblower Center, and Project on Government Oversight as Amici Curiae in Support of Petitioner, Parkinson v. Dep't of Justice, No. 17-1098 (U.S. Mar. 8, 2018).
Brief of Former U.S. Counterterrorism and National Security Officials as Amici Curiae in Support of Petitioners, Jesner v. Arab Bank, PLC, No. 16-499 (U.S. June 27, 2017).
Brief of Amicus Curiae Fair Punishment Project in Support of Petitioner, Hidalgo v. Arizona, No. 17-251 (U.S. Sept. 15, 2017).

Congressional Testimony

ISIS Post-Caliphate: Threat Implications for America and the West: Hearing Before the H. Comm. on Homeland Sec., 115th Cong., May 23, 2018 (Statement of Joshua A. Geltzer), (CIS No.: 2018-H411-187084).