Was Anneliese Michel truly possessed by demonic forces, or was she suffering from a more earthly psychological affliction such as an extreme case of Obsessive Compulsive Disorder with Scrupulosity, epilepsy, PTSD or Anti-NMDA Receptor Encephalitis? Tonight we examine this case from the solely scientific, clinical angle with our interview of Dr. Jennifer Sy, Ph.D. of the Houston OCD Program. Dr. Sy is a licensed clinical psychologist with training in cognitive-behavioral treatment of mood and anxiety disorders. She received a BA in Cognitive Science from Dartmouth College in Hanover, New Hampshire, and her MS and Ph.D. in Clinical Psychology from the University of Wyoming. She has published on cognitive/behavioral mechanisms and exposure-based treatment of social anxiety, specific phobias, and panic.