Professor of Psychiatry and Biobehavioral Sciences at the UCLA David Geffen School of Medicine and Director of the Child OCD, Anxiety, and Tic Disorders Program at the Center for Child Anxiety Resilience Education and Support (CARES) at the UCLA Semel Institute for Neuroscience and Human Behavior. He is the found Chair of the Tourette Association of America Behavioral Science Consortium which developed the Comprehensive Behavioral Intervention for Tics (CBIT). He has authored over 240 publications and book chapters and co-authored or co-edited several books.