President at Friends of the Earth

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

CEO, WRI México at World Resources Institute

Director of Energy Research & Analysis at Union of Concerned Scientists

Global Director, Energy at World Resources Institute

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

Senior Fellow, Geopolitics of Energy Project at Harvard Belfer Center for Science and International Affairs

Senior Bilingual Energy Analyst at Union of Concerned Scientists

Senior Fellow at Peterson Institute for International Economics

Trustee at National Bureau of Economic Research

Research Fellow at American University in New York City /NY

Chair in Finance Education at NYU in New York, NY

Director of Social Trends Research at Pew Research Center

Professor of Economic History at University of Pennsylvania

Professor of Political Science, Department Deputy Chair at Columbia University

Chair of Political Science at Brown University, Watson Institute for International and Public Affairs

Professor in Political Science, Senior Fellow at the Hoover Institution at Stanford, Department of Political Science

Visiting Assistant Professor of Political Science and Consortium for Faculty Diversity at Amherst College

Professor of Political Science, Iowa State University in Ames, IA

Professor and former chair of the Department of Political Science at Columbia University