Per F. Peterson is Professor and Chair of the Department of Nuclear Engineering at the University of California, Berkeley. After joining UCB in 1990 as an Assistant Professor he received a NSF Presidential Young Investigator award, and most recently received the Fusion Power Associates Excellence in Fusion Engineering Award. He has worked on problems in energy and environmental systems, including advanced light water reactors, inertial fusion energy, high level nuclear waste processing, and repository safeguards. His research interests include topics in heat and mass transfer, fluid dynamics, and phase change. His broader interests in energy and environment focus on nuclear technologies and nuclear materials management, and methods to enhance long-term proliferation resistance and physical security in the nuclear fuel cycle.