Stefan G. Hofmann, PhD, is professor of psychology in the department of psychological and brain sciences at Boston University. He has been president of numerous professional organizations, and is currently editor in chief of Cognitive Therapy and Research. He has published more than 400 peer-reviewed journal articles and twenty books. He is a highly cited researcher, and has received many awards, including the Humboldt Research Award. His research focuses on the mechanism of treatment change, translating discoveries from neuroscience into clinical applications, emotion regulation, and cultural expressions of psychopathology. He is codeveloper (with Steven C. Hayes) of process-based therapy.