William F. Cornell, MA, TSTA (P), maintains an independent private practice of psychotherapy and consultation in Pittsburgh, PA.

Anne de Graaf, MA, is TSTA-O & CTA-P and owner of and trainer at RondHeel, consultation and training in the Netherlands.

Trudi Newton is an educational trainer and supervisor in transactional analysis with a passion for supervision as a resource and means of co-created learning. She works worldwide in a wide range of learning contexts, including as a coach supervisor.

Moniek Thunnissen, MD, PhD, is a teaching and supervising transactional analyst in psychotherapy.