Member of the National Academy of Sciences and a Fellow of the American Academy of Arts and Sciences, the American Physical Society, the American Association for the Advancement of Science, and the California Academy of Sciences.
Chair of the Committee on International Security and Arms Control of the National Academy of Sciences.
The Teresa and John Heinz Professor of Environmental Policy and Director of the Program on Science, Technology, and Public Policy in the John F. Kennedy School of Government, and Professor of Environmental Science and Public Policy in the Department of Earth and Planetary Sciences, at Harvard University.
Distinguished Visiting Scientist at the Woods Hole Research Center and Professor Emeritus of Energy and Resources at the University of California, Berkeley.
MacArthur Foundation Prize (1981), Volvo Environment Prize with Paul Ehrlich (1993), Forum Award of the American Physical Society (1994) Tyler Prize (2000).
Author of about 300 articles and reports on plasma physics, fusion energy technology, energy and resource options in industrial and developing countries, global environmental problems, impacts of population growth, and international security and arms control.