Jason Lillis, PhD, is an Assistant Professor (Research) in the Department of Psychiatry and Human Behavior at the Warren Alpert Medical School of Brown University and a clinical psychologist at the Weight Control and Diabetes Research Center of The Miriam Hospital. He earned his PhD in clinical psychology from the University of Nevada, Reno followed by a postdoctoral fellowship in health services research at Stanford University. Dr. Lillis is a leading researcher and an internationally recognized trainer of Acceptance and Commitment Therapy. He currently lives with his wife and two children in Roseville, California.