1. Research Biochemist, Food and Drug Administration.
2. Professor, Department of Pediatrics, Montefiore Hospital and Medical Center, Albert Einstein College of Medicine.
3. Associate Professor, Department of Pediatrics, University of Wisconsin.
4. Statistician, Food and Drug Administration.
5. Specialist, Department of Biochemistry, University of Wisconsin.
6. Professor and Chairman, Department of Biochemistry, University of Wisconsin.