Johnny L. Matson, Ph.D., is a Distinguished Research Master and Director of the Ph.D. program in clinical psychology in the Department of Psychology at Louisiana State University in Baton Rouge, LA. He is the author of more than 450 publications, including 34 books. In addition, he is the editor-in-chief of two research journals, Research in Developmental Disabilities and Research in Autism Spectrum Disorders. He has served as an expert for the United States Department of Justice, Civil Right Division, and is past president of the Mental Retardation and Developmental Disabilities Division of the American Psychological Association. His research and clinical interests are in autism spectrum disorders and intellectual disabilities.