1. Received his PhD from the University of Minnesota, He is professor and chairman, Division of Special Education, University of Iowa, Iowa City. His research interests are learning disabilities and meta-analysis
2. Received his EdD from the University of California, Los Angeles. He is professor of psychiatry and biobehavioral sciences and principal of the inpatient school at the UCLA Neuropsychiatric Institute. His research interest is direct classroom observation of children with learning or behavior problems.