2022 Sciences Po, Paris School of International Affairs, Alliance (visiting) Professor, January-May
2022-2025 London School of Economics, Centennial (visiting) Professor
2017 École Polytechnique, Department of Economics, Paris., Alliance (visiting) Professor, Department of Economics (May-June)
2016 Institute for Advanced Study, Berlin (Wissenschaftskolleg zu Berlin), Fellow (Fall semester)
2015 Université de Paris 1 Panthéon-Sorbonne., Visiting Professor, Department of Economics (June-July)
2012-13 Princeton University Institute for International and Regional Studies., Visiting Research Scholar
Columbia University, School of International and Public Affairs & Earth Institute, Vice Dean, SIPA, 2010-2012, 2018-2021
2009- Columbia University, School of International and Public Affairs & Earth Institute, Lenfest-Earth Institute Professor of Natural Resource Economics
2007 Harvard University Center for the Environment, Visiting Scholar (one week in May)
2006 Yale University Center for the Study of Globalization, Distinguished Visiting Fellow (Spring semester)
2006 Centre for Advanced Study, Norwegian Academy of Science and Letters, Visiting Scholar (one week in January)
Johns Hopkins University School of Advanced International Studies, Washington, DC., Director, Global Health & Foreign Policy Initiative, 2006-2009
1999-2009 Johns Hopkins University School of Advanced International Studies, Washington, DC., Professor of Environmental Economics & International Political Economy
1999-2009 Johns Hopkins University School of Advanced International Studies, Washington, DC., Director, International Policy Program
1988-1999 London Business School, University of London., Associate Professor of Economics, 1993-1999
London Business School, University of London., Dean, Executive MBA Programme, 1992-1995
London Business School, University of London., Assistant Professor of Economics, 1988-1993
1991-1995 Centre for Social and Economic Research on the Global Environment, University College London., Research Director, International Environmental Agreements