1. Professor of Internal Medicine and Chief, Nutrition Section, at the University of California, Davis School of Medicine.
2. Chief, Department of Nutrition, Letterman Army Institute of Research.
3. Director, Letterman Army Institute of Research.
4. Research Biochemist, Letterman Army Institute of Research.
5. Associate Professor of Nutrition with the Department of Nutrition, College of Agricultural and Environmental Sciences, University of California, Davis.
6. Associate Scientific Investigator, INCAP, Guatemala, C. A.
7. Senior Research Officer with the National Institute of Nutrition, Hyderabad 500029