1. Pediatric Endocrinology. Genetics, and Metabolism. National Institutes of Health/ Georgetown University Fellowship Program. Bethesda. MD
2. Section on Pediatric Endocrinology. Developmental Endocrinology Branch, and Director. Pediatric Endocrinology Training Program, National Institute of Child Health and Human Development. Bethesda. He is also Professor of Pediatrics. Physiology, and Biophysics. Georgetown University. Washington. DC.