Steven C. Hayes, Ph.D Clinical Psychology, West Virginia University, Morgantown, is a Foundation Professor of Psychology at the University of Nevada. An author of 44 books and nearly 600 scientific articles, he is known for his work on Acceptance and Commitment Therapy, a widely used and researched method of psychological and behavioral intervention, and Relational Frame Theory, a comprehensive empirical research program on human language and cognition. Dr. Hayes has received the Lifetime Achievement Award from the Association for Behavioral and Cognitive Therapy, and is among the most cited psychologists in the word.

David D. Burns is an adjunct professor emeritus in the Department of Psychiatry and Behavioral Sciences at the Stanford University School of Medicine and the author of the best-selling books Feeling Good: The New Mood Therapy and The Feeling Good Handbook. Burns popularized Aaron T. Beck's cognitive behavioral therapy (CBT) when his book became a best seller during the 1980s.