Los Alamos National Laboratory
Scientist
U.S. House of Representatives
National Security Science Fellow
U.S. Senate
National Security Science Fellow
U.S. Senate
Senior Policy Advisor
Institute for Defense Analyses
Research Staff Member
George Washington University
National Security Studies Program
Selwyn College, University of Cambridge
Microsoft Research Visiting Fellow
Department of Energy, Climate and Environmental Sciences Division
Program Manager for Earth System Modeling
Bighorn Center for Public Policy
Fellow
Princeton University
Cornell University