Sharon Squassoni's research, writing and policy-making has focused on reducing risks from nuclear energy and weapons for three decades. She has held senior positions at the State Department, Arms Control and Disarmament Agency and the Congressional Research Service, as well as the Carnegie Endowment for International Peace and the Center for Strategic & International Studies She is on the Science and Security Board of the Bulletin of Atomic Scientists, the PIR Center and the Center for Arms Control and Nonproliferation.