Marc J. Tassé, PhD is a Professor in the Department of Psychology and Department of Psychiatry and Behavioral Health at The Ohio State University. He is also the Director of the Ohio State Nisonger Center, a University Center for Excellence in Developmental Disabilities. Dr. Tassé has more than 30 years of experience in conducting research and providing clinical services in the field of intellectual disability (ID), autism spectrum disorder (ASD), and related neurodevelopmental disorders (ND). He has significant clinical and research experience working with people with ID/ASD/ND, including people with co-occurring mental/behavioral health concerns. Dr. Tassé has been involved in the development of several standardized tests including Diagnostic Adaptive Behavior Scale, Supports Intensity Scale for Children, Supports Intensity Scale for Adults, Nisonger Child Behavior Rating Form, and the Quebec Adaptive Behavior Scale. His publications include more than 175 articles in peer-reviewed journals, book chapters, and books. He has given 300+ scientific and professional presentations and invited addresses. Dr. Tassé is a Fellow of the American Association on Intellectual and Developmental Disabilities, American Psychological Association, and International Association for the Scientific Study of Intellectual and Developmental Disabilities.