Certification: C.T.R.S. or "Expressive therapist" meaning an individual who provides treatment intervention through the use of such activities as art, music, dance; who is certified or registered by the national expressive therapist association, certification board for music therapists, American arts therapy association, 5122-14-01 3 American dance therapy association, or is licensed, certified or registered by another recognized state or national body to practice expressive therapy. It serves communities across nine states and provides a range of services, including acute and ambulatory care, a dental plan, and academic business lines.