Discussion with keynote speakers moderated by SIEGFRIED HECKER, Center for International Security and Cooperation, Stanford University, Distinguished Visiting Scientist, Vienna Center for Disarmament and Non-Proliferation, and Emeritus Director, Los Alamos National Laboratory;Speakers: HANS BLIX, former Director General, International Atomic Energy Agency and former Executive Chairman, United Nations Monitoring, Verification and Inspection Commission; and ELLEN TAUSCHER, former United States Under Secretary of State for Arms Control and International Security