Kasia Mendelsohn is the Acting Deputy Administrator for the Office of Defense Nuclear Nonproliferation (DNN) at the U.S. Department of Energy’s National Nuclear Security Administration (DOE/NNSA). Ms. Mendelsohn previously served as Principal Assistant Deputy Administrator and Policy Director for DNN and as the Assistant Deputy Administrator for Nonproliferation and Arms Control (NPAC).
Ms. Mendelsohn has served in several other capacities at DOE/NNSA, including as the Associate Assistant Deputy Administrator for NPAC, Director of NPAC Policy, Director of the NPAC Office of Nuclear Safeguards, Director of the Office of Global Nuclear Material Threat Reduction within the Office of Global Threat Reduction, Deputy Director for the Global Regimes/Regional Security and the Nonproliferation Policy program in the Office of Nonproliferation Policy, and as DOE/NNSA’s representative to the U.S. Biological Weapons Convention protocol negotiations. Prior to joining DOE/NNSA in 1999, Ms. Mendelsohn worked as a defense contractor for DynCorp.
Much of Ms. Mendelsohn’s career has focused on addressing urgent national security issues, including countering the growth of plutonium and highly enriched uranium stockpiles, strengthening multilateral nonproliferation treaties and agreements, and enhancing international nuclear safeguards and security of nuclear materials and facilities worldwide.
Ms. Mendelsohn holds a bachelor’s degree in political science from Barnard College and a master’s degree in international security policy from Columbia University’s School of International and Public Affairs.