Visiting Scholar, Resources for the Future, 1995 - present.
Special Assistant to the President for Economic Policy, Executive Office of the President, National Economic Council, 1993 - 1995.
Assistant Director, BP Europe, Strategy and European Affairs, 1990 - 1991.
Vice President, BP America, Corporate Planning, 1987 - 1989.
Director, The Standard Oil Company, Business Environment and Corporate Development, 1987.
Manager, BP Exploration, Planning, 1985 - 1986.
Manager, Sohio Petroleum Company, Economics, Planning and Budgets, 1982 - 1984.
Manager, Sohio Petroleum Company, Economics, 1981 - 1982.
Deputy Assistant Secretary, U.S. Department of the Interior, Policy, Budget and Administration, 1977 - 1981.
Acting Assistant Secretary, U.S. Department of the Interior, Program Development and Budget, 1977.
Director, U.S. Department of the Interior, Office of Policy Analysis, 1976 - 1977.
Senior Economist, U.S. Senate Committee on the Budget, 1976.
Assistant Director, U.S. Department of the Interior, Office of Policy Analysis, 1974 - 1975.
Senior Research Associate, The Urban Institute, 1971 - 1974.
Visiting Fellow, Princeton University, Woodrow Wilson School of Public and International Affairs, 1970 - 1971.
Economist, MATHEMATICA, Inc., 1967 - 1970.
Research Fellow, The Brookings Institution, 1966 - 1967.
Summer Intern, U.S. Department of Health, Education and Welfare, 1966.
Summer Intern, President's Council of Economic Advisers, 1965.