Ellyn and Peter co-founded The Couples Institute in 1986 and have an impressive legacy in couples therapy training. They are creators of The Developmental Model of Couples Therapy, a model that teaches therapists how to diagnose, intervene, and significantly help troubled relationships. They have presented workshops to therapists throughout the United States as well as Europe, Asia, South America, and Australia, and Ellyn currently conducts an online program that has trained professionals from 56 countries.