1. Steven R. Forness is professor of psychiatry and biobehavioral sciences, chief of outpatient educational psychologists, inpatient school principal, and director of the interdisciplinary training program in developmental disabilities at UCLA Neuropsychiatric Hospital. He received his EdD from UCLA in special education. His research interests focus on comorbidity of learning and behavioral disorders. Address: Steven R. Forness, UCLA Neuropsychiatric Hospital, 760 Westwood Plaza, Los Angeles, CA 90024.
2. James M. Swanson is professor of pediatrics and psychiatry and clinical director of the Child Development Center, University of California, Irvine. He received his PhD in psychology from The Ohio State University. His research interests are in attention deficit disorders.
3. Dennis P. Cantwell is Joseph Campbell Professor of Psychiatry and biobehavioral sciences and director of training in child psychiatry at the UCLA Neuropsychiatric Hospital. He received his MD from Washington University Medical School in St. Louis. His research interests are in childhood depression, attention deficit disorders, and learning disorders.
4. Daniel Youpa is a doctoral student in psychology at the University of California, Santa Cruz. He was a research assistant at the University of California, Irvine, at the time of the study.
5. Gregory L. Hanna is assistant professor of psychiatry at the University of Michigan. He received his MD from the University of Oklahoma. His research interests focus on attention deficit disorders, childhood depression, and obsessive-compulsive disorders.