Senior Fellow, Resources for the Future, 1990 - present.
Adjunct Professor, Georgetown University, Georgetown Public Policy Institute, 1991 - present.
Consultant, Harvard Institute of International Development (HIID), 1993 - 1998.
Consultant, The World Bank, 1995 - present.
Visiting Professor, University of California at Santa Barbara, Departments of Economics and Environmental Studies, 1990 - 1991.
Fellow, Resources for the Future, 1980 - 1990.
Consultant, Pace University Law School, 1990.
Consultant, Exeter Associates, Inc., 1988.
Consultant, U.S. Forest Service, 1985.
Consultant, Los Alamos Scientific Laboratory, 1980.
Research Associate, Resources for the Future, 1976 - 1979.
Consultant, John Muir Institute, 1978.
Systems Analyst, Eastman Kodak Company, 1970 - 1973.