It has published 26 ACT titles , including several by Hayes , who co-founded ACT and is one of its leading theorists .
New Harbinger is a leading publisher in the area of Acceptance and Commitment Therapy ( ACT ) .
New Harbinger has published 26 Acceptance and Commitment Therapy titles , including several by Hayes , who co-founded Acceptance and Commitment Therapy and is one of New Harbinger 's leading theorists .
New Harbinger is a leading publisher in the area of Acceptance and Commitment Therapy ( ACT ) .