Associate Director - Energy and Minerals at United States Geological Survey

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

Adjunct Lecturer in Public Policy at Harvard Kennedy School

President at Friends of the Earth

Professor of Practice in Global Management at Thunderbird at Thunderbird School of Global Management

Associate Professor of Political Science at Tufts University, School of Arts and Sciences

Professor of Government at Claremont McKenna College

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

Faculty Affiliate at U.S. Immigration Policy Center, UCSD

Senior National Security Fellow at Center for Immigration Studies

President, Inter-American Dialogue at Inter-American Dialogue

Professor of Political Science and Senior Fellow at the Freeman Spogli Institute for International Studies at Stanford, Department of Political Science

Professor of Politics and International Affairs at Princeton University

Professor Emeritus of the Pacific Rim at Claremont McKenna College