Leonard Weiss is a visiting scholar at Stanford University’s Center for International Security and Cooperation (CISAC). He is also a national advisory board member of the Center for Arms control and Non-Proliferation in Washington, DC. He began his professional career as a PhD 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 legislation that created the Defense Nuclear Facilities Safety Board. In addition, he led notable investigations of the nuclear programs of India and Pakistan. 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 the Nonproliferation Review. His current research interests include an assessment of the impact on the nonproliferation regime of nuclear trade with non-signers of the Nuclear Nonproliferation Treaty, and more generally the relationship of energy security concerns with nonproliferation.

For a comprehensive list of Dr. Weiss's publications, click here.

David Holloway is the Raymond A. Spruance Professor of International History, a professor of political science, and an FSI senior fellow. He was co-director of CISAC from 1991 to 1997, and director of FSI from 1998 to 2003. His research focuses on the international history of nuclear weapons, on science and technology in the Soviet Union, and on the relationship between international history and international relations theory. His book Stalin and the Bomb: The Soviet Union and Atomic Energy, 1939-1956 (Yale University Press, 1994) was chosen by the New York Times Book Review as one of the 11 best books of 1994, and it won the Vucinich and Shulman prizes of the American Association for the Advancement of Slavic Studies. It has been translated into seven languages, most recently into Chinese. The Chinese translation is due to be published later in 2018. Holloway also wrote The Soviet Union and the Arms Race (1983) and co-authored The Reagan Strategic Defense Initiative: Technical, Political and Arms Control Assessment (1984). He has contributed to the Bulletin of the Atomic Scientists, Foreign Affairs, and other scholarly journals.

Since joining the Stanford faculty in 1986 -- first as a professor of political science and later (in 1996) as a professor of history as well -- Holloway has served as chair and co-chair of the International Relations Program (1989-1991), and as associate dean in the School of Humanities and Sciences (1997-1998). Before coming to Stanford, he taught at the University of Lancaster (1967-1970) and the University of Edinburgh (1970-1986). Born in Dublin, Ireland, he received his undergraduate degree in modern languages and literature, and his PhD in social and political sciences, both from Cambridge University.

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.

Målfrid Braut-Hegghammer is an Associate Professor of Political Science at the University of Oslo. She first joined CISAC as a visiting associate professor and Stanton nuclear security junior faculty fellow in September 2012, and was a Stanford MacArthur Visiting Scholar between 2013-15. Between 2008 and 2010 she was a predoctoral and postdoctoral fellow at Harvard University's Belfer Center for Science and International Affairs. Braut-Hegghammer received her PhD, entitled “Nuclear Entrepreneurs: Drivers of Nuclear Proliferation” from the London School of Economics in 2010. She received the British International Studies Association’s Michael Nicholson Thesis Prize that same year for her work.

Scott D. Sagan is Co-Director and Senior Fellow at the Center for International Security and Cooperation, the Caroline S.G. Munro Professor of Political Science, and the Bass University Fellow in Undergraduate Education at Stanford University. He also serves as Co-Chair of the American Academy of Arts and Sciences’ Committee on International Security Studies. Before joining the Stanford faculty, Sagan was a lecturer in the Department of Government at Harvard University and served as special assistant to the director of the Organization of the Joint Chiefs of Staff in the Pentagon.

Sagan is the author of Moving Targets: Nuclear Strategy and National Security (Princeton University Press, 1989); The Limits of Safety: Organizations, Accidents, and Nuclear Weapons (Princeton University Press, 1993); and, with co-author Kenneth N. Waltz, The Spread of Nuclear Weapons: An Enduring Debate (W.W. Norton, 2012). He is the co-editor of Insider Threats (Cornell University Press, 2017) with Matthew Bunn; and co-editor of The Fragile Balance of Terror (Cornell University Press, 2022) with Vipin Narang. Sagan was also the guest editor of a two-volume special issue of Daedalus: Ethics, Technology, and War (Fall 2016) and The Changing Rules of War (Winter 2017).

Recent publications include “Creeds and Contestation: How US Nuclear and Legal Doctrine Influence Each Other,” with Janina Dill, in a special issue of Security Studies (December 2025); “Kettles of Hawks: Public Opinion on the Nuclear Taboo and Noncombatant Immunity in the United States, United Kingdom, France, and Israel”, with Janina Dill and Benjamin A. Valentino in Security Studies (February 2022); “The Rule of Law and the Role of Strategy in U.S. Nuclear Doctrine” with Allen S. Weiner in International Security (Spring 2021); “Does the Noncombatant Immunity Norm Have Stopping Power?” with Benjamin A. Valentino in International Security (Fall 2020); and “Just War and Unjust Soldiers: American Public Opinion on the Moral Equality of Combatants” and “On Reciprocity, Revenge, and Replication: A Rejoinder to Walzer, McMahan, and Keohane” with Benjamin A. Valentino in Ethics & International Affairs (Winter 2019).

In 2022, Sagan was awarded Thérèse Delpech Memorial Award from the Carnegie Endowment for International Peace at their International Nuclear Policy Conference. In 2017, he received the International Studies Association’s Susan Strange Award which recognizes the scholar whose “singular intellect, assertiveness, and insight most challenge conventional wisdom and intellectual and organizational complacency" in the international studies community. Sagan was also the recipient of the National Academy of Sciences William and Katherine Estes Award in 2015, for his work addressing the risks of nuclear weapons and the causes of nuclear proliferation. The award, which is granted triennially, recognizes “research in any field of cognitive or behavioral science that advances understanding of issues relating to the risk of nuclear war.” In 2013, Sagan received the International Studies Association's International Security Studies Section Distinguished Scholar Award. He has also won four teaching awards: Stanford’s 1998-99 Dean’s Award for Distinguished Teaching; Stanford's 1996 Hoagland Prize for Undergraduate Teaching; the International Studies Association’s 2008 Innovative Teaching Award; and the Monterey Institute for International Studies’ Nonproliferation Education Award in 2009.