1. Assistant Professor Preventive Medicine, Departamento de Medicina Preventiva, Escola Paulista de Medicina, Sao Paulo, SP., Brazil.
2. Director Epidemiology of Brain Disorders, Research Department, New York State Psychiatric Institute, Professor of Public Health (Epidemiology) in the Sergievsky Center, Columbia University.
3. Gertrude H. Sergievsky Professor of Epidemiology, Faculty of Medicine, Columbia University, Director, Gertrude H. Sergievsky Center, Columbia University.
4. Principal Research Scientist, Adjunct Assistant Professor of Public Health (Epidemiology), School of Public Health, Columbia University.
5. Predoctoral Fellow, Epidemiology of Mental Retardation Training Program, Columbia University.