Laura Holgate, Nuclear Threat Initiative; Caroline Jorant, AREVA; Tariq Rauf, International Atomic Energy Agency; Ambassador Pedro Raul Villagra Delgado, Ministry of Foreign Affairs, Argentina. 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.