Roz Shafran is Professor of Translational Psychology at UCL Great Ormond Street Institute of Child Health. She is a clinical psychologist and has extensive clinical and research expertise in cognitive behavioural theory and treatment of psychological disorders across the age range. She has co-authored three self-help books and one edited book including Overcoming Perfectionism, The CBT Handbook and The Complete CBT Guide for Anxiety; she has written over 250 peer-reviewed publications. She has three children.

Martin M. Antony, PhD, ABPP, is Professor of Psychology at Ryerson University in Toronto, Ontario, Canada. He was founding director of the Anxiety Treatment and Research Clinic and the Psychology Residency Program at St. Joseph’s Healthcare Hamilton. The recipient of career awards from the Society of Clinical Psychology (Division 12 of the American Psychological Association), the Canadian Psychological Association (CPA), and the Anxiety and Depression Association of America, Dr. Antony is a Fellow of the Royal Society of Canada and has served as president of the CPA and the Association for Behavioral and Cognitive Therapies. He has published over 30 books and 275 scientific articles and book chapters on cognitive-behavioral therapy, psychological assessment, anxiety disorders, obsessive–compulsive disorder, and perfectionism.