Steve Coll, The New Yorker; David Albright, Institute for Science and International Security; Matti Tarvainen, International Atomic Energy Agency; Ralf Wirtz, Oerlikon Leybold Vacuum. This session was part of the 2007 Carnegie International Nonproliferation Conference, “Tomorrow's Solutions,” June 25–26, in Washington, D.C., which addressed the critical challenges confronting the nonproliferation regime and offered policy recommendations to stop the spread and use of nuclear weapons and materials.