Jennifer Krafft, PhD , is an assistant professor at Mississippi State University whose work focuses on acceptance and commitment therapy (ACT), self-help, and hoarding. She is editor of a book on innovations in ACT, has received grant funding from the Association for Contextual Behavioral Science (ACBS), and has published thirty-five journal articles. Clarissa W. Ong, PhD , is an assistant professor at the University of Louisville. She serves as associate editor for the Journal of Contextual Behavioral Science . She has published two ACT books; has contributed to more than seventy journal articles, including those on ACT, hoarding, and perfectionism; and has received grant funding from ACBS and the International OCD Foundation (IOCDF). Michael E. Levin, PhD , is a professor at Utah State University.

He is an ACBS fellow and past editor in chief of the Journal of Contextual Behavioral Science , the peer-reviewed ACBS journal. He is a leading researcher on developing, evaluating, and disseminating self-guided ACT interventions for a wide range of mental health concerns. He has conducted more than fifty clinical trials evaluating ACT self-help interventions, and has made several of these programs publicly available as part of the USU ACT Guide suite of services. Michael P. Twohig, PhD , is a professor in the psychology department at Utah State University. He is a past president of ACBS. He has written more than 200 peer-reviewed publications and over ten books, and has received funding from many organizations, including the National Institute of Mental Health (NIMH). Foreword writer David F.

Tolin, PhD , is founder and director of the Anxiety Disorders Center and the Center for Cognitive Behavioral Therapy at the Hartford Hospital Institute of Living in Hartford, CT. He is author of Face Your Fears and Doing CBT .