Glenn S. Gerstell is a lawyer and technology writer. Currently, he is a senior adviser at the Center for Strategic & International Studies, where he writes on technology and national security matters.From 2015 to 2020, Gerstell served as the General Counsel of the United States National Security Agency (NSA). Before that, he was a member of the US National Infrastructure Advisory Council and a Commissioner of the Washington, D.C. Homeland Security Commission.Gerstell received his B.A. from New York University and his J.D. from Columbia University.