David L. Clark is a retired Los Alamos National Laboratory (LANL) Fellow and Guest Scientist with the Laboratory’s Glenn T. Seaborg Institute for Actinide Science.  He was LANL’s Director of the National Security Education Center from 2013-2025.

His research interests are in the molecular and electronic structure of actinide materials, applications of synchrotron radiation to nuclear security, behavior of actinide and fission products in the environment, the aging effects in nuclear weapons materials, and the education of judges on the methods of science.  He is an international authority on the chemistry and physics of the actinides, and has published nearly 200 peer-reviewed publications, encyclopedia and book chapters. He is the co-Editor of the six volume Plutonium Handbook, portions of which were written while a CISAC Visiting Scholar in 2015.

Clark served as inaugural Director of the Los Alamos Glenn T. Seaborg Institute for Transactinium Science between 1997-2009. He has served the DOE as a technical advisor for environmental stewardship including the Rocky Flats cleanup and closure (1995-2005), closure of High-Level Waste tanks at the Savannah River Site (2011), and as a technical advisor to the DOE High Level Waste Corporate Board (2009-2011). He is a Fellow of the American Association for the Advancement of Science, and a Los Alamos Laboratory Fellow.  He is the recipient of two ACS national awards - the Nobel Laureate Signature Award (1988) and the Glenn Seaborg Award in Nuclear Chemistry (2017). He has also been honored with several Defense Programs Awards of Excellence.

He received a B.S. in chemistry in 1982 from the University of Washington, and a Ph.D. in 1986 from Indiana University. Clark was a postdoctoral fellow at the University of Oxford before joining Los Alamos National Laboratory as a J. Robert Oppenheimer Fellow in 1988. 

Benjamin Valentino is a Professor of Government at Dartmouth College and Chair of the Government Department. His research interests include the causes and consequences of violent conflict and American foreign and security policies. At Dartmouth he teaches courses on international relations, international security, American foreign policy, the causes and prevention of genocide and serves as co-director the Government Department Honors Program. He is also the faculty coordinator for the War and Peace Studies Program at Dartmouth’s Dickey Center for International Understanding. Professor Valentino’s book, Final Solutions: Mass Killing and Genocide in the 20th Century, received the Edgar S. Furniss Book Award for making an exceptional contribution to the study of national and international security. His work has appeared in outlets such as The New York Times, The Wall Street Journal, Foreign Affairs, The American Political Science Review, Security Studies, International Organization, Public Opinion Quarterly, World Politics and The Journal of Politics. He is currently working on several research projects focusing on public opinion on the use of force and developing early warning models of large-scale violence against civilians.