During the strategic modernization program that the Soviet Union undertook in the 1970s, it deployed a large number of multiple-warhead ballistic missiles. This deployment raised concerns in the United States about vulnerability of its land-based missile force and was one of the factors that contributed to the military buildup that the United States undertook in the late 1970s-early 1980s. The newly available documents that contain evidence of the Soviet missile programs demonstrate that the "window of vulnerability" did not exist and provide some insight into the Soviet modernization program.

Pavel Podvig joined CISAC as a research associate in 2004. Before that he was a researcher at the Center for Arms Control, Energy and Environmental Studies at the Moscow Institute of Physics and Technology (MIPT). He worked as a visiting researcher with the Security Studies Program at MIT and with the Program on Science and Global Security at Princeton University, and he taught physics in MIPT's General Physics Department for more than ten years.

Podvig graduated with honors from the Moscow Institute of Physics and Technology in 1988, with a degree in physics. In 2004 he received a PhD in political science from the Moscow Institute of World Economy and International Relations.

His research has focused on technical and political issues of missile defense, space security, U.S.-Russian relations, structure and capabilities of the Russian strategic forces, and nuclear nonproliferation. He was the head of the Russian Strategic Nuclear Forces research project and the editor of a book of the same title, which is considered a definitive source of information on Russian strategic forces.

Leonard Weiss is a senior science fellow at CISAC and a consultant to the Lawrence Livermore National Laboratory. He began his professional career as a researcher in mathematical system theory at the Research Institute for Advanced Studies in Baltimore. This was followed by tenured professorships in applied mathematics and electrical engineering at Brown University and the University of Maryland. During this period he published widely in the applied mathematics literature. In 1976 he received a Congressional Science Fellowship that resulted in a career change. For more than two decades he worked for Senator John Glenn as the staff director of both the Senate Subcommittee on Energy and Nuclear Proliferation and the Committee on Governmental Affairs. He was the chief architect of the Nuclear Nonproliferation Act of 1978 and other legislation sponsored by Senator Glenn. Since retiring from the Senate staff in 1999, he has published numerous articles on nonproliferation issues for the Bulletin of Atomic Scientists, Arms Control Today, and other journals. In 2003-4 he chaired the Federation of American Scientists' Advisory Committee on Weapons in Space which produced the FAS report entitled "Ensuring America's Space Security." His research at CISAC includes an assessment of the impact on the nonproliferation regime of nuclear trade with non-signers of the Nuclear Nonproliferation Treaty.

Pavel Podvig (speaker) joined CISAC as a research associate in 2004. Before that he was a researcher at the Center for Arms Control, Energy and Environmental Studies at the Moscow Institute of Physics and Technology (MIPT). He worked as a visiting researcher with the Security Studies Program at MIT and with the Program on Science and Global Security at Princeton University, and he taught physics in MIPT's General Physics Department for more than ten years.

Podvig graduated with honors from the Moscow Institute of Physics and Technology in 1988, with a degree in physics. In 2004 he received a PhD in political science from the Moscow Institute of World Economy and International Relations.

His research has focused on technical and political issues of missile defense, space security, U.S.-Russian relations, structure and capabilities of the Russian strategic forces, and nuclear nonproliferation. He was the head of the Russian Strategic Nuclear Forces research project and the editor of a book of the same title, which is considered a definitive source of information on Russian strategic forces.

Theodore Postol (discussant) is a professor of science, technology and national security policy in the Program in Science, Technology, and Society at MIT. He did his undergraduate work in physics and his graduate work in nuclear engineering at the Massachusetts Institute of Technology. After receiving his Ph.D., Postol joined the staff of Argonne National Laboratory, where he studied the microscopic dynamics and structure of liquids and disordered solids using neutron, x-ray and light scattering, along with computer molecular dynamics techniques. Subsequently he went to the Congressional Office of Technology Assessment to study methods of basing the MX Missile, and later worked as a scientific adviser to the Chief of Naval Operations. After leaving the Pentagon, Postol helped to build a program at Stanford University to train mid-career scientists to study developments in weapons technology of relevance to defense and arms control policy. In 1990 Postol was awarded the Leo Szilard Prize from the American Physical Society. In 1995 he received the Hilliard Roderick Prize from the American Association for the Advancement of Science and in 2001 he received the Norbert Wiener Award from Computer Professionals for Social Responsibility for uncovering numerous and important false claims about missile defenses.

Plutonium (Pu) and highly enriched uranium (HEU), the fissile material that is the sine qua non of nuclear weapons, manifest fingerprints that are unique to the manufacturing processes employed in their creation. Such fingerprints are not as clear as those made famous by the FBI for decades, or as DNA is today, but they are fingerprints, nonetheless. The technical challenge is to develop the processes that will link, beyond reasonable doubt, the fissile material to its manufacturer. If the technical challenges can be met, political challenges lay beyond and must be resolved before the civilized world can be assured that the fissile material that generates a nuclear explosion can be traced to its source, but if it can, many benefits to society will result. Among these are deterrence of potential suppliers, credible delay in reacting to nuclear terrorism, and international cooperation of the highest sort.

Harold Smith holds the appointment of distinguished visiting scholar and professor with the Goldman School of Public Policy at the University of California, Berkeley (UCB), where he focuses on the impact of technology on foreign and defense policy. In 1993, Smith served as assistant to the scretary of defense for nuclear, chemical, and biological defense programs during the Clinton administration. In 1960 he joined the faculty of UCB where he retired as professor and chairman of the Department of Applied Science in 1976. Smith was awarded a White House Fellowship in 1966 and was assigned as a special assistant to the secretary of defense. Since that time, he has served as an advisor to numerous governmental boards on national security policy. Of particular note are his chairmanship of the Vulnerability Task Force of the Defense Science Board and a special study for (then) Secretary of Defense Schlesinger on the Airborne Warning and Control System (AWACS); i.e. the Smith Report. He has published in the New York Times, the Christian Science Monitor, the Wall Street Journal, U.S. News and World Report, and Arms Control Today. He received his PhD in nuclear engineering from the Massachusetts Institute of Technology.

Bill Dunlop is currently a senior scientist at Lawrence Livermore National Laboratory (LLNL) and has held numerous positions during his career there, including serving as the project manager for strategic missile and defensive weapons systems, the program manager for the development of the W87 warhead for the MX missile, and the program manager for earth penetrator weapons. From 1985 until 1990 he was the division leader overseeing work on thermonuclear weapons development. From January 1994 until December 1995, he served as the technical advisor to the U.S. ambassador to the Conference on Disarmament. The principal activity during this period in the Conference on Disarmament was the negotiation of the Comprehensive Test Ban Treaty. After his return from Geneva, Dunlop resumed the leadership of the Arms Control and Treaty Verification Program, which later was renamed the Proliferation Prevention and Arms Control (PPAC) Program. He continues to work part-time at LLNL where he is involved cargo security issues and defense activities. Dunlop received his BA in physics from the University of Pennsylvania. He received his MS in physics and his PhD in nuclear physics from the Univesity of California, Los Angeles.