Dr. Joshua A. Geltzer serves as Deputy Assistant to the President and Deputy Homeland Security Advisor.  He served previously as Special Assistant to the President and Special Advisor to the Homeland Security Advisor on Countering Domestic Violent Extremism, and in that role he oversaw the development of the U.S. Government’s first-ever National Strategy for Countering Domestic Terrorism.  Before returning to government service, Geltzer was the founding Executive Director and Visiting Professor of Law at Georgetown Law’s Institute for Constitutional Advocacy and Protection.  He was also an International Security Program Fellow at New America and an Executive Editor at Just Security.  Geltzer served from 2015 to 2017 as Senior Director for Counterterrorism at the National Security Council, 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.  Geltzer received his J.D. from Yale Law School, where he served as editor-in-chief of the Yale Law Journal, his PhD in War Studies from King’s College London, where he was a Marshall Scholar, and his undergraduate degree from Princeton University, where he studied in the Princeton School of Public and International Affairs.

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