1. Postdoctoral Research Fellow, Laboratory of Molecular Biology.
2. Staff Scientist, Laboratory of Molecular Biology, National Institute of Mental Health.
3. Staff Scientist, Genomics Core, National Institute of Diabetes, Digestive and Kidney Disease, National Institutes of Health, Bethesda, Maryland.
4. Undergraduate Intern, Laboratory of Molecular Biology. Current position: National Institute of Neurological Disorders and Stroke, National Institutes of Health.
5. Staff Scientist, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health.
6. Senior Investigator, Laboratory of Molecular Biology, National Institutes of Health.