Thomas Guarrieri is a Assistant Research Scientist in the Unconventional Weapons and Technology (UWT) Division. Prior to joining START, Guarrieri taught undergraduate courses in terrorism, American foreign policy, and international relations, at the University of Missouri. Additionally, he has taught seminars in quantitative methods and statistical computing using R, Stata, and SPSS, and is EITM certified. Guarrieri holds a Ph.D. in Political Science from the University of Missouri, and a B.A. in Political Science and Philosophy from Rutgers University. As an advocate of multimethod research, his dissertation utilizes both game theory and quantitative analyses to examine how terrorist groups respond to offensive counterterrorism tactics. Specifically, his dissertation focuses on how leadership targeting affects the strategic behavior of terrorist groups. His current research focuses on the intersection of adversarial behavior and CBRN (chemical, biological, radiological, and nuclear) threats. He has published in the Oxford Research Encyclopedia of Politics, the Review of International Organizations, and was co-editor of a special issue of the International Studies Review. In 2016, he served as the Program Assistant for the 57th Annual Convention of the International Studies Association (ISA) in Atlanta, Georgia. He was born in Trenton, New Jersey, and resides in Washington, D.C.