Siegfried S. Hecker is a professor emeritus (research) in the Department of Management Science and Engineering and a senior fellow emeritus at the Freeman Spogli Institute for International Studies (FSI). He was co-director of CISAC from 2007-2012. From 1986 to 1997, Dr. Hecker served as the fifth Director of the Los Alamos National Laboratory. Dr. Hecker is an internationally recognized expert in plutonium science, global threat reduction, and nuclear security.

Dr. Hecker’s current research interests include nuclear nonproliferation and arms control, nuclear weapons policy, nuclear security, the safe and secure expansion of nuclear energy, and plutonium science. At the end of the Cold War, he has fostered cooperation with the Russian nuclear laboratories to secure and safeguard the vast stockpile of ex-Soviet fissile materials. In June 2016, the Los Alamos Historical Society published two volumes edited by Dr. Hecker. The works, titled Doomed to Cooperate, document the history of Russian-U.S. laboratory-to-laboratory cooperation since 1992.

Dr. Hecker’s research projects at CISAC focus on cooperation with young and senior nuclear professionals in Russia and China to reduce the risks of nuclear proliferation and nuclear terrorism worldwide, to avoid a return to a nuclear arms race, and to promote the safe and secure global expansion of nuclear power. He also continues to assess the technical and political challenges of nuclear North Korea and the nuclear aspirations of Iran.

Dr. Hecker joined Los Alamos National Laboratory as graduate research assistant and postdoctoral fellow before returning as technical staff member following a tenure at General Motors Research. He led the laboratory's Materials Science and Technology Division and Center for Materials Science before serving as laboratory director from 1986 through 1997, and senior fellow until July 2005.

Among his professional distinctions, Dr. Hecker is a member of the National Academy of Engineering; foreign member of the Russian Academy of Sciences; fellow of the TMS, or Minerals, Metallurgy and Materials Society; fellow of the American Society for Metals; fellow of the American Physical Society, honorary member of the American Ceramics Society; and fellow of the American Academy of Arts and Sciences.

His achievements have been recognized with the Presidential Enrico Fermi Award, the 2020 Building Bridges Award from the Pacific Century Institute, the 2018 National Engineering Award from the American Association of Engineering Societies, the 2017 American Nuclear Society Eisenhower Medal, the American Physical Society’s Leo Szilard Prize, the American Nuclear Society's Seaborg Medal, the Department of Energy's E.O. Lawrence Award, the Los Alamos National Laboratory Medal, among other awards including the Alumni Association Gold Medal and the Undergraduate Distinguished Alumni Award from Case Western Reserve University, where he earned his bachelor's, master's, and doctoral degrees in metallurgy.

Philip Taubman is affiliated with the Center for International Security and Cooperation at Stanford University. Before joining CISAC in 2008, Mr. Taubman worked at the New York Times as a reporter and editor for nearly 30 years, specializing in national security issues, including United States diplomacy, and intelligence and defense policy and operations. He served as Moscow bureau chief and Washington bureau chief, among other posts. He is author of Secret Empire: Eisenhower, the CIA, and the Hidden Story of America's Space Espionage (2003), The Partnership: Five Cold Warriors and Their Quest to Ban the Bomb (2012),  In the Nation's Service: The Life and Times of George P. Shultz (2023), as well as co-author (with his brother, William Taubman) of McNamara at War: A New History (2025).

James Fearon is the Theodore and Frances Geballe Professor in the School of Humanities and Sciences and a professor of political science. He is a Senior Fellow at FSI, affiliated with CISAC and CDDRL. His research interests include civil and interstate war, ethnic conflict, the international spread of democracy and the evaluation of foreign aid projects promoting improved governance. Fearon was elected to the National Academy of Sciences in 2012 and the American Academy of Arts and Sciences in 2002. Some of his current research projects include work on the costs of collective and interpersonal violence, democratization and conflict in Myanmar, nuclear weapons and U.S. foreign policy, and the long-run persistence of armed conflict.

James Fearon is the Theodore and Frances Geballe Professor in the School of Humanities and Sciences and a professor of political science. He is a Senior Fellow at FSI, affiliated with CISAC and CDDRL. His research interests include civil and interstate war, ethnic conflict, the international spread of democracy and the evaluation of foreign aid projects promoting improved governance. Fearon was elected to the National Academy of Sciences in 2012 and the American Academy of Arts and Sciences in 2002. Some of his current research projects include work on the costs of collective and interpersonal violence, democratization and conflict in Myanmar, nuclear weapons and U.S. foreign policy, and the long-run persistence of armed conflict.

Gil-li Vardi joined CISAC as a visiting scholar in December 2011. She completed her PhD at the London School of Economics in 2008, and spent two years as a research fellow at the Oxford Leverhulme Programme on the Changing Character of War at the University of Oxford, after which she joined Notre Dame university as a J. P. Moran Family Assistant Professor of Military History.

Her research examines the interplay between organizational culture, doctrine, and operational patterns in military organizations, and focuses on the incentives and dynamics of change in military thought and practice.

Driven by her interest in both the German and Israeli militaries and their organizational cultures, Vardi is currently revising her dissertation, "The Enigma of Wehrmacht Operational Doctrine: The Evolution of Military Thought in Germany, 1919-1941," alongside preparing a book manuscript on the sources of the Israeli Defence Forces’ (IDF) early strategic and operational perceptions and preferences.

Lynn Eden is a Senior Research Scholar Emeritus. She was a Senior Research Scholar at Stanford University's Center for International Security and Cooperation until January 2016, as well as was Associate Director for Research. Eden received her Ph.D. in sociology from the University of Michigan, held several pre- and post-doctoral fellowships, and taught in the history department at Carnegie Mellon before coming to Stanford.

In the area of international security, Eden has focused on U.S. foreign and military policy, arms control, the social construction of science and technology, and organizational issues regarding nuclear policy and homeland security. She co-edited, with Steven E. Miller, Nuclear Arguments: Understanding the Strategic Nuclear Arms and Arms Control Debates (Ithaca, N.Y.: Cornell University Press, 1989). She was an editor of The Oxford Companion to American Military History (New York: Oxford University Press, 2000), which takes a social and cultural perspective on war and peace in U.S. history. That volume was chosen as a Main Selection of the History Book Club.

Eden's book Whole World on Fire: Organizations, Knowledge, and Nuclear Weapons Devastation (Ithaca: Cornell University Press, 2004; New Delhi: Manas Publications, 2004) explores how and why the U.S. government--from World War II to the present--has greatly underestimated the damage caused by nuclear weapons by failing to predict damage from firestorms. It shows how well-funded and highly professional organizations, by focusing on what they do well and systematically excluding what they don't, may build a poor representation of the world--a self-reinforcing fallacy that can have serious consequences, from the sinking of the Titanic to not predicting the vulnerability of the World Trade Center to burning jet fuel. Whole World on Fire won the American Sociological Association's 2004 Robert K. Merton Award for best book in science, knowledge, and technology.

Eden has also written on life in small-town America. Her first book, Crisis in Watertown (Ann Arbor: University of Michigan Press, 1972), was her college senior thesis; it was a finalist for a National Book Award in 1973. Her second book, Witness in Philadelphia, with Florence Mars (Baton Rouge: Louisiana State University Press, 1977), about the murders of civil rights workers Schwerner, Chaney, and Goodman in the summer of 1964, was a Book of the Month Club Alternate Selection.