| Visiting Scholar, Resources for the Future, Washington, D.C, May 2010 to the present
Independent consultant and economist, Bethesda, MD, January 2010 to the present
Deputy Commissioner for Policy, FDA, January 2007 to August 2009
Deputy Commissioner for Policy, FDA, January 2007 to August 2009
Associate Commissioner for Policy and Planning, Food and Drug Administration, April 2005 to January 2007
Chief Economist, Office of Planning, Office of Policy and Planning, Food and Drug Administration, March 2003 to April 2005
Resident Scholar at the American Enterprise Institute and Fellow with the AEI-Brookings Joint Center for Regulatory Studies, August 1998 to March 2003
Senior Economist for the environment and regulation, the President's Council of Economic Advisers, Executive Office of the President, July 1997 - August 1998
Staff Economist for the Office of Information and Regulatory Affairs, Office of Management and Budget, Executive Office of the President, September 1991 - July 1997
Adjunct Professor, Department of Economics, American University, January 1995 - May 1995
Assistant Professor of Managerial Economics and Policy, School of Management, State University of New York at Buffalo, 1985 – 1991
Associate Director, Institute for the Study of Free Enterprise Systems at the State University of New York at Buffalo, 1987 – 1991
Development Consultant, U.S. Embassy, Yaounde, Cameroon, 1980
Staff, Peace Corps, Cameroon, 1980
Management Advisor, cocoa marketing cooperative, Peace Corps, Cameroon, 1978-1980
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