- Consultant to the World Bank.
- Economist, Senior Economist, Principal Economist and Lead Economist, The World Bank (Mar 1988-Aug 2005),
- Senior Economist, Bureau of Economics, Federal Trade Commission, (Sep 1974-Mar 1988),
- Visiting Senior Economist, Development Research Department, the World Bank (Oct 1985-Oct 1986),
- Assistant professor of Economics, Ohio State University (Sep 1970-Sep 1974),
- Instructor, Department of Economics, University of Rhode Island (summer of 1968 & 1969).