Clarissa OngClarissa W. Ong, PhD, is a postdoctoral associate at the Center for Anxiety and Related Disorders at Boston University. She received her doctoral degree in clinical/counseling psychology from Utah State University, and completed her clinical internshp at McLean Hospital/Harvard Medical School. Her research interests include acceptance and commitment therapy (ACT), process-based therapy, obsessive-compulsive disorder (OCD), hoarding disorder, and perfectionism. She has contributed to more than sixty peer-reviewed publications and a book. She has also received funding from the Association for Contextual Behavioral Science (ACBS).Michael P. Twohig, PhD, is well known for his work in ACT and OCD, which is closely related to perfectionism. Twohig is professor in the psychology department at Utah State University. He is past president of the ACBS, and a current member of the Association for Behavioral and Cognitive Therapies (ABCT). He has written more than 170 peer-reviewed publications, seven books, and has received funding from many organizations, including the National Institute of Mental Health (NIMH).Randy O. Frost, PhD, teaches abnormal psychology at Smith College in Northampton, MA. He is coauthor of Buried in Treasures. Read More Read Less