Astronomer at McDonald Observatory, University of Texas at Austin

Astronomer at McDonald Observatory, University of Texas at Austin

Member of the Board at Harvard Belfer Center for Science and International Affairs

Astronomer, Research Associate at McDonald Observatory, University of Texas at Austin

Professor, Arizona State University, School of Earth and Space Exploration in Phoenix, AZ

Astronomy at McDonald Observatory, University of Texas at Austin

Astronomer at McDonald Observatory, University of Texas at Austin

Director of Energy Research & Analysis at Union of Concerned Scientists

Senior Bilingual Energy Analyst at Union of Concerned Scientists

Vice President and Regional Director for Africa at World Resources Institute

Associate Chair, Political Science Department at University of Utah

President at Friends of the Earth

Global Director, Energy at World Resources Institute

Southeast Region Director at United States Geological Survey

Associate Professor of Civil and Environmental Engineering at Princeton University

Senior Vice President, Natural Climate Solutions at Conservation International

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

Senior Climate Scientist, Director of Climate Science at Union of Concerned Scientists

Chief Scientist at United States Geological Survey

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

Senior Vice President of the Moore Center for Science at Conservation International