John P. Holdren is assistant to the president for science and technology, director of the White House Office of Science and Technology Policy, and co-chair of the President's Council of Advisors on Science and Technology (PCAST). He previously was the Teresa and John Heinz Professor of Environmental Policy and director of the Program on Science, Technology, and Public Policy at Harvard University's Kennedy School of Government, professor in Harvard's Department of Earth and Planetary Sciences and director of the independent, nonprofit Woods Hole Research Center. At the University of California, Berkeley, he co-founded in 1973 and co-led until 1996 the interdisciplinary graduate-degree program in energy and resources. During the Clinton administration Holdren served as a member of PCAST through both terms and in that capacity chaired studies on preventing theft of nuclear materials, disposition of surplus weapon plutonium, the prospects of fusion energy, U.S. energy R&D strategy and international cooperation on energy-technology innovation. He holds advanced degrees in aerospace engineering and theoretical plasma physics from MIT and Stanford. He is a member of the National Academy of Sciences, the National Academy of Engineering, and the American Academy of Arts and Sciences, as well as a foreign member of the Royal Society of London and former president of the American Association for the Advancement of Science. He has served on the MacArthur Foundation’s Board of Trustees, as chair of the National Academy of Sciences Committee on International Security and Arms Control, and as co-chair of the independent, bipartisan National Commission on Energy Policy. His awards include a MacArthur Foundation Prize Fellowship, the John Heinz Prize in Public Policy, the Tyler Prize for Environmental Achievement, and the Volvo Environment Prize. In December 1995, he gave the acceptance lecture for the Nobel Peace Prize on behalf of the Pugwash Conferences on Science and World Affairs, an international organization of scientists and public figures.