William E. MacLean is a senior scientist and associate director of the Waisman Center at the University of Wisconsin-Madison. He earned a doctoral degree in clinical psychology from George Peabody College for Teachers in 1980 and completed a clinical internship in pediatric psychology at the University of North Carolina at Chapel Hill in 1981. He was a faculty member at Peabody College of Vanderbilt University for 15 years and for 18 years at the University of Wyoming. He has an extensive record of leadership in clinical and research training at the doctoral and post-doctoral levels. He served as director of graduate programs in clinical psychology for 16 years. He also co-directed NIH supported research training programs in behavioral pediatrics and intellectual disability at Vanderbilt University. MacLean was editor of the American Journal of Mental Retardation from 2002-2008 and is currently a member of the editorial board of the Journal of Mental Health Research in Intellectual Disabilities. He was elected president of the Division on Intellectual and Developmental Disabilities of the American Psychological Association and was a member of the Human Development and Aging Study Section of the NIH Center for Scientific Review. Dr. MacLean is a Fellow of the American Association on Intellectual and Developmental Disabilities, the American Psychological Association and the Society of Pediatric Psychology.