Peter J. Bieling, PhD, is Associate Professor in the Department of Psychiatry and Behavioural Neurosciences at McMaster University and Director of Mood and Anxiety Services of St. Joseph's Healthcare, Hamilton, Ontario. He has published widely in the areas of depression and cognitive-behavioral therapy. A Founding Fellow in the Academy of Cognitive and Behavioral Therapies, he is an active therapist, teacher of cognitive-behavioral therapy, and consultant.

Randi E. McCabe, PhD, is Chair of the Clinical Behavioural Sciences Programme in the Faculty of Health Sciences and Assistant Professor in the Department of Psychiatry and Behavioural Neurosciences at McMaster University, and is Associate Director of the Anxiety Treatment and Research Centre at St. Joseph's Healthcare. She has published widely on anxiety, eating disorders, and cognitive-behavioral therapy, and is the author of three books for consumers. An active trainer and workshop presenter, she is on the editorial board of The Clinical Psychologist and maintains a private practice focusing on eating disorders.

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, 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.