Elna Yadin, Ph.D. is a psychologist and Director of the OCD Clinic, Center for the Treatment and Study of Anxiety (CTSA), University of Pennsylvania. ** Edna B. Foa, Ph.D.** is a Professor of Clinical Psychology in Psychiatry and Director of the Center for the Treatment and Study of Anxiety (CTSA), ...

Elna Yadin, Ph.D. is a psychologist and Director of the OCD Clinic, Center for the Treatment and Study of Anxiety (CTSA), University of Pennsylvania. ** Edna B. Foa, Ph.D.** is a Professor of Clinical Psychology in Psychiatry and Director of the Center for the Treatment and Study of Anxiety (CTSA), University of Pennsylvania. ** Tracey K. Lichner, Ph.D.** is a psychologist and Director of Supervision at Center for the Treatment and Study of Anxiety (CTSA), University of Pennsylvania.