Sharon Squassoni, Carnegie Endowment for International Peace; Peter Bradford, formerly with the Nuclear Regulatory Commission; Charles Ferguson, Council on Foreign Relations; Corey Hinderstein, Nuclear Threat Initiative; Henry Sokolski, Nonproliferation Policy Education Center. 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.