Jedidiah Siev, Ph.D., is an assistant professor in NSU's Center for Psychological Studies. He is also the director of NSU's Anxiety Treatment Center and the OCD and Related Disorders Clinic. Siev completed a post-doctoral fellowship and pre-doctoral internship at the Massachusetts General Hospital and Harvard Medical School, following doctoral training at the University of Pennsylvania.

Siev's research focuses on information processing, judgment and decision making, and meta-cognitive processes involved in the maintenance and reduction of OCD and anxiety symptoms. He has a research grant from the International OCD Foundation to study scrupulosity, an OCD presentation characterized by religious or moral fears.

As a clinician, Siev has considerable experience working with individuals who have OCD, anxiety disorders, body dysmorphic disorder, and tic disorders.