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Seth J. Gillihan, PhD, is a licensed psychologist and creator of the Think Act Be online school. He specializes in evidence-based mindful CBT for depression, anxiety, OCD, PTSD, stress, and insomnia. Seth is a certified therapist and supervisor in Prolonged Exposure therapy for PTSD and a Fellow of the Center for Neuroscience and Society at the University of Pennsylvania. He served on the faculty of the world-renowned Center for Treatment and Study of Anxiety as well as the department of psychiatry, and he also taught full time in the psychology department at Haverford College.

Seth is also best-selling author of several books, including Mindful Cognitive Behavioral Therapy: A Simple Path to Healing, Hope, and Peace (forthcoming); The CBT Deck; The CBT Deck for Anxiety, Rumination, & Worry; The CBT Deck for Kids & Teens (co-author); The CBT Flip Chart; A Mindful Year (co-author). Seth has also co-authored over forty book chapters and peer-reviewed research articles, and he has presented his research nationally and internationally.