1. Clinical Fellow.
2. Statistician.
3. Chief, Biostatistics Core, Division of Population and Health Promotion Sciences, National Institute of Dental and Craniofacial Research.
4. Senior Research Fellow.
5. Chief, Laboratory of Neurogenetics, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health.
6. Senior Investigator, Pain and Neurosensory Mechanisms Branch.