Dr. Charles D. Ferguson, a physicist, is Scientist-in-Residence based in the Washington, D.C., office of the Monterey Institute's Center for Nonproliferation Studies (CNS). He and Dr. William Potter, the Director of CNS, are co-directing the Different Faces of Nuclear Terrorism project, which is systematically assessing how to prevent and respond to nuclear and radiological terrorism. The major findings of this project will soon be published by the Nuclear Threat Initiative in the forthcoming book The Four Faces of Nuclear Terrorism. Prior to joining CNS in early 2002, Dr. Ferguson served as a Foreign Affairs Officer in the Office of the Senior Coordinator for Nuclear Safety in the Bureau of Nonproliferation, U.S. Department of State. A distinguished graduate of the United States Naval Academy, he has served on a fleet ballistic missile submarine and studied nuclear engineering at the Naval Nuclear Power School. After leaving the Navy, he earned a Ph.D. in physics from Boston University. As a physicist, he has worked at the Los Alamos National Laboratory, the University of Maryland's Institute for Physical Science and Technology, the Harvard-Smithsonian Center for Astrophysics, and the Space Telescope Science Institute. As a security analyst, he has conducted arms control research at the Federation of American Scientists.