Dr. Gillihan was on the faculty at the Center for the Treatment and Study of Anxiety at the University of Pennsylvania from 2008-2012. His research publications include articles and book chapters on the effectiveness of cognitive-behavioral therapy (CBT) for OCD, anxiety, and depression, how CBT helps people to get better, and the use of brain imaging to study psychiatric disorders. Dr. Gillihan's clinical practice is located in Haverford, PA.