He is a diplomate of the American Board of Professional Psychology (ABPP), a fellow of both American Psychological Association (APA) and Association for Psychological Science (APS), a Past President of Division 29 (Psychotherapy) of APA, current President of Division 12 (Clinical) of APA, and a two-term Past-President (international) of the Society for Psychotherapy Research (SPR).
He has published over 350 scholarly articles and chapters and is the author or co-author of 15 books on psychotherapy, assessment, and psychopathology.
He is currently the director of the National Center on the Psychology of Terrorism in Palo Alto, California.
Systematic treatment selection (STS) is an empirically derived approach to the practice of psychotherapy.
It revolves around the use of an expert system to guide the clinician's thinking about how best to approach a particular case.