Carl was the second President of the New York Institute for Gestalt Therapy, succeeding Lore Perls, and was the second President of AAGT. He is a Trainer and a Fellow of the Institute.
He has taught in Graduate Programs at Fordham University, Hunter College School of Social Work, and Istituto di Gestalt in Italy. He does periodic training and special weekend groups at the Gestalt Centre London where he is on the Visiting Faculty, and he teaches Experiential Approaches to Psychotherapy in the Graduate Psychology Department at Brooklyn College. He sees private patients and does supervision in New York.