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Marc J. Tassé, PhD

Marc J. Tassé, Ph.D. is the Director of the Ohio State University (OSU) Nisonger Center, a University Center for Excellence in Developmental Disabilities (UCEDD). He is also a Professor of Psychology and Psychiatry at OSU.  Dr. Tassé’s experience includes 20 years of experience in conducting research and providing clinical services in the field of intellectual disability (formerly known as mental retardation) and related developmental disabilities. Dr. Tassé has conducted over 100 trainings, workshops, and presentations related to intellectual disability. His publication record includes more than 70 articles in peer-reviewed journals, chapters, and books in the area of intellectual and developmental disabilities.

He is a co-author of the AAIDD (2002 and 2010) Terminology and Classification Manual and AAIDD User’s Guide (Schalock et al., 2007) as well as Chair of the AAIDD task force working on the development of the Diagnostic Adaptive Behavior Scale. He has also co-authored several published standardized assessment instruments in the field of intellectual and developmental disabilities, including the assessment of adaptive behavior, assessment of problem behavior, and measurement of support needs.  Dr. Tassé is a Fellow of the American Association on Intellectual and Developmental Disabilities and recipient of the AAIDD Service Award (2007 & 2009). Dr. Tassé has consulted and testified in several capital cases involving intellectual disabilities determination.