William C. Clark is the Harvey Brooks Professor of International Science, Public Policy and Human Development at Harvard University's Kennedy School of Government. Trained as an ecologist, his research focuses on the interactions of environment, development and security concerns in international affairs, with a special emphasis on the role of science and technology in shaping those interactions. Clark is co-author of Adaptive Environmental Assessment and Management (Wiley, 1978) and Redesigning Rural Development (Hopkins, 1982); editor of the Carbon Dioxide Review (Oxford,1982); and coeditor of Sustainable Development of the Biosphere (Cambridge,1986), The Earth as Transformed by Human Action (Cambridge, 1990), Learning To Manage Global Environmental Risks (MIT, 2001), and Global Environmental Assessments: Information and Influence (MIT, 2006). He is an Associate Editor of the Proceedings of the US National Academy of Sciences, and serves on the editorial boards of Annual Review of Environment and Natural Resources and Environment: Science and Policy for Sustainable Development. Clark is a member of the U.S. National Academy of Sciences, where he serves on the Roundtable on Science and Technology for Sustainability and co-chaired the study Our Common Journey: A Transition Toward Sustainability (National Research Council, 1999). He is co-founder and board member of the international Initiative on Science and Technology for Sustainability (ISTS), and chairs the environmental reporting program of the Heinz Center for Science, Economics and the Environment which produces a periodic report on The State of the Nations Ecosystems (Cambridge University Press, 2002, 2005). At Harvard, he co-directs the Sustainability Science Program at the University's Center for International Development. Clark is a recipient of the MacArthur Prize, the Humboldt Prize, and the Kennedy School's Carballo Award for excellence in teaching.