BA in Economics, Harvard College; MA in Philosophy, Politics and Economics; Rhodes Scholar, University of Oxford; JD, Yale Law School. With US Environmental Protection Agency: 1989-90, Special Assistant and Deputy Chief of Staff; 1991-93, Deputy Assistant Administrator for Policy. 1993-94, Senior Fellow, Peterson Institute for International Economics, Washington DC; since 1994, Hillhouse Professor of Environmental Law and Policy, Yale University; 2000-01, Visiting Professor, INSEAD, Fontainebleau, France; 2006, Director, Yale Center for Environmental Law & Policy and Center for Business and Environment, Yale University; 2007-09, Environment and Energy Adviser, Obama campaign and Member, Presidential Transition Team. 2011, Commissioner, Connecticut Department of Energy and Environmental Protection. Member, Council on Foreign Relations.