Stephen V. Faraone, PhD, is currently Associate Professor of Psychology in the Harvard Department of Psychiatry, Massachusetts Mental Health Center, and Director of Research, Pediatric Psychopharmacology Clinic, Massachusetts General Hospital. Ming T. Tsuang, MD, PhD, DSc, is currently Stanley Cobb Professor of Psychiatry at Harvard Medical School; Superintendent and Head of the Harvard Department of Psychiatry at the Massachusetts Mental Health Center; and Director of the Institute of Psychiatric Epidemiology and Genetics jointly sponsored by the Harvard Schools of Medicine and Public Hea...