What the author of Facing our Fears uses as support is a quote from a resercher at the University of Pennsylvania, David A. Yusko, Psy.D. He is the Clinical Director at the Center for the Treatment and Study of Anxiety (CTSA) in the Perelman School of Medicine at the University of Pennsylvania. Yusko especializes in many kinds of therapies, and in the case of this article in cognitive-behavioral treatment for social anxiety, panic disorder, specific phobias, and generalized anxiety.