Gordon L. Flett, PhD is professor in the department of psychology at York University in Toronto, Canada, where he holds a Canada Research Chair in Personality & Health and is also director of the LaMarsh Centre for Child and Youth Research. Dr. Flett is most recognized for his seminal contributions to research and theory on the role of perfectionism in pathology. His other research interests include the study of feelings of mattering to others in health and well-being, and the nature and correlates of suicidality in the elderly. Dr. Flett is a Fellow of the Association for Psychological Science, which has cited him as one of the top 25 most productive authors in psychology.

Paul L. Hewitt, PhD is a professor in the department of psychology at the University of British Columbia. He is a registered clinical psychologist, and his research focuses primarily on personality vulnerabilities and their implications for psychological difficulties among adults, adolescents, and children. Dr. Hewitt is a fellow of the Canadian Psychological Association and of the Association's Section on Clinical Psychology. He was cited as one of the top 10 Canadian clinical psychology professors for research productivity, and was awarded the Donald O. Hebb Award for Distinguished Contributions to Psychology as a Science by the Canadian Psychological Association. Dr. Hewitt has published over 300 research papers, books, and chapters on perfectionism, psychopathology, and psychotherapy.