Dr. John P. Holdren was 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) in the Obama administration. Before that he was 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, as well as professor in Harvard's Department of Earth and Planetary Sciences and Director of the independent, nonprofit Woods Hole Research Center. Dr. Holdren 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 served as a member of the MacArthur Foundation’s Board of Trustees from 1991 to 2005, as Chair of the National Academy of Sciences Committee on International Security and Arms Control from 1994 to 2005, and as Co-Chair of the independent, bipartisan National Commission on Energy Policy from 2002 to 2009. 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. Jonathan Koomey is a lecturer at Stanford University. He holds M.S. and Ph.D. degrees from the Energy and Resources Group at UC Berkeley, and an A.B. in History and Science from Harvard University. His academic work, summarized in nine books and more than 200 articles and reports, spans engineering, economics, public policy and environmental science. He holds a 4th degree black belt in the Japanese martial art of Aikido, and enjoys hiking, cooking, and playing classical contrabass in his spare time. For more details go to [http://www.koomey.com].