Li Bin is a senior associate working jointly in the Nuclear Policy Program and the Asia Program at the Carnegie Endowment for International Peace. A physicist and expert on nuclear disarmament, his research focuses on China’s nuclear and arms control policy and on US-Chinese nuclear relations. He is also a professor of international relations at Tsinghua University. He previously directed the arms control division at the Institute of Applied Physics and Computational Mathematics, where he also served as executive director of the Program for Science and National Security Studies. Li was a Social Science Research Council–MacArthur Foundation Peace and Security Fellow at the Massachusetts Institute of Technology and Princeton University. In 1996, he joined the Chinese delegation on the Comprehensive Test Ban Treaty negotiations.