Jennifer Gregg, PhD, is a full professor in the department of psychology at San Jose State University; and a clinical psychologist at the University of California, San Francisco, where she works with cancer patients and their families. She is an ACBS peer-reviewed ACT trainer, and has been delivering, conducting research studies, and training clinicians in ACT and other mindfulness-based approaches since 1997.
Glenn M. Callaghan, PhD, is associate professor of psychology at San Jose State University and a member of the Association for Behavioral and Cognitive Therapies and Western Psychological Association. He is an internationally recognized expert in functional analytic psychotherapy and functional assessment methodology.
Steven C. Hayes, PhD, is Nevada Foundation Professor in the department of psychology at the University of Nevada, Reno. He has been president of numerous professional organizations, is author of forty-five books and nearly 650 scientific articles, and is among the most cited living psychologists. He has shown in his research how language and thought leads to human suffering, and is originator and codeveloper of acceptance and commitment therapy (ACT): a powerful therapy method that is useful in a wide variety of areas; relational frame theory (RFT): an empirical program in language and cognition; and process-based therapy (with Stefan G. Hofmann).