The ACT community has agreed not to set up our own therapist certification. There is a process to recognize ACT trainers. ACT trainers sign a values statement agreeing to make their training protocols available for low cost or no cost and agreeing not to make proprietary claims or to certify therapists.
Why reject therapist certification? Two reasons: it ossifies the method, and creates a hierarchy that cannot be readily dismantled. Instead, the ACT community provides ways to increasing sophistication and ability; conducts studies on training methods; and encourages all ACT therapists to constantly improve. On the website, therapists can list themselves as ACT therapists whenever they choose, but are asked to list their training experiences.