Steven C. Hayes, PhD, is a Nevada Foundation Professor at the Department of Psychology at the University of Nevada. An author of over 38 books and 550+ scientific articles, his career has focused on analyzing the nature of human language and cognition, and applying this knowledge to understanding and alleviating human suffering.

A Note About Changes in the Included Articles Steven C. Hayes Functional Foundations of a Contextual Behavioral Approach: Professional and Personal History Steven C. Hayes I: Origins and Assumptions Introduction Fredrick Chin and Steven C. Hayes Article 1. Rule-Governed Behavior: A Potential Theoretical Framework for Cognitive-Behavior Therapy Robert Zettle and Steven C. Hayes Article 2. Falsification and the Protective Belt Surrounding Entity Postulating Theories Steven C. Hayes Article 3. Making Sense of Spirituality Steven C. Hayes Article 4. Finding the Philosophical Core: A Review of Stephen C. Pepper's "World Hypotheses." Steven C. Hayes, Linda J. Hayes, and Hayne W. Reese Article 5. Mentalism, Behavior Behavior Relations, and A Behavior Analytic View of the Purposes of Science Steven C. Hayes and Aaron Brownstein Article 6. Analytic Goals and the Varieties of Scientific Contextualism Steven C. Hayes Article 7. Behavioral Epistemology Includes Nonverbal Knowing Steven C. Hayes II: Principles and Strategies Introduction Fredrick Chin and Steven C. Hayes Article 8. Verbal relations and the evolution of behavior analysis Steven C. Hayes and Linda J. Hayes Article 9. Hayes, S. C., Nelson, R. O. & Jarrett, R. (1987) Treatment utility of assessment: A functional approach to evaluating the quality of assessment. Steven C. Hayes, Rosemery O. Nelson, and Robin Jarrett Article 10. Experiential avoidance and behavioral disorders: A functional dimensional approach to diagnosis and treatment Steven C. Hayes, Kelly G. Wilson, Elizabeth V. Gifford, Victoria M. Follette, and Kirk Strosahl III: Clinical Methods and Developmental Vision Introduction Fredrick Chin and Steven C. Hayes Article 11. Acceptance and Commitment Therapy Relational Frame Theory, and the third wave of behavior therapy Steven C. Hayes Article 12. Buddhism and Acceptance and Commitment Therapy Steven C. Hayes Article 13. Acceptance and Commitment Therapy: Model, processes, and outcomes Steven C. Hayes, Jason Luoma, Akihiko Masuda, and Jason Lillis Article 14. Contextual behavioral science: Creating a science more adequate to the challenge of the human condition Steven C. Hayes, Dermot Barnes-Holmes, and Kelly G. Wilson Epilogue Looking to the Future of ACT, RFT, and Contextual Behavioral Science Fredrick Chin and Steven C. Hayes