Edwin Lyman is a senior scientist in the Global Security program at the Union of Concerned Scientists in Washington, DC. Before coming to UCS in May 2003, he was president of the Nuclear Control Institute, a Washington-based organization committed to nuclear nonproliferation. He earned a doctorate in physics from Cornell University in 1992. From 1992 to 1995, he was a postdoctoral research associate at Princeton University's Center for Energy and Environmental Studies (now the Science and Global Security Program). His research focuses on the prevention of nuclear proliferation, nuclear and radiological terrorism, and nuclear accidents. He has published articles and letters in journals and magazines including Science, The Bulletin of the Atomic Scientists, Science and Global Security, Arms Control Today and Nuclear Engineering International. He is the author of the entry on nuclear power safety in the Encyclopedia of Environmental Health (Elsevier, 2011). He is an active member of the Institute of Nuclear Materials Management. He has testified before Congress on numerous occasions, and has served as an expert witness for intervenors in several NRC licensing proceedings.