Princeton’s Nuclear Futures Laboratory is a multidisciplinary initiative of the Department of Mechanical and Aerospace Engineering and the Woodrow Wilson School of Public and International Affairs. The research of our group focuses on the technical aspects of nuclear-fuel-cycle technologies and policy questions related to nuclear energy and nuclear-weapon proliferation. Work on these issues is primarily located in two important contexts that have emerged only recently: Proposals to increase reliance on nuclear energy, as part of the effort to mitigate climate change, and proposals to cut deeply the numbers of nuclear weapons and perhaps even eliminate them entirely. We collaborate closely with Princeton’s Program on Science and Global Security and with the International Panel on Fissile Materials (IPFM).