Director of Energy Research & Analysis at Union of Concerned Scientists

Faculty Affiliate, Harvard Project on Climate Agreements at Harvard Belfer Center for Science and International Affairs

Global Director, Energy at World Resources Institute

President at Friends of the Earth

Former President and CEO Emeritus at World Resources Institute

Environmental Science and Public Policy Lecturer, Harvard University in Cambridge, MA

Research Fellow at American University in New York City /NY

Professor of Political Science & Co-Director of Global Studies Program at Swarthmore College

Professor of Medicine and Developmental Biology, Professor of Chemistry at Washington University of St. Louis, School of Medicine

Associate Professor of History, College of Arts & Sciences at Boston University

Associate Professor of Political Science at Stanford, Department of Political Science

Professor of Chinese Studies & Director of the Lau China Institute at King’s College, London in London, ENG

Senior Researcher at Pew Research Center