Research economist University Wisconsin, Ithaca, 1971-1972. Associate professor Rockefeller Foundation, Manila, 1974-1976. From assistant professor to professor nutrition University North Carolina, Chapel Hill, adjunct professor, Department of Economics.
Director University of North Carolina Interdisciplinary Obesity Center, Nutrition Transition Research Program. Consultant Afro-Urban Institute, Milwaukee, 1970, United States Agency for International Development, 1976, World Bank, Washington, 1991-1997, International Food Policy Research Institute, Washington, since 1998. Board trustees Pan American Health Education Foundation, Washington, 1990-1996.
Board directors Dannon Foundation, New York City, since 1998.
Fellow Woodrow Wilson Foundation, Carolina Population Center. Member International Union Nutritional Sciences (chair nutrition transition committee 1998), American Society Nutritional Sciences, Population Association American, American Economics Association, Lineberger Comprehensive Cancer Center, Delta Omega Honorary Public Health Society, Phi Kappa Phi, Phi Eta Sigma.