Philip J. Guerin, Jr., MD, the founding director of the Center for Family Learning in Rye Brook, New York, is the originator of the genogram and cognitive systems models of psychotherapy for families, couples, and individuals. A former faculty member at Albert Einstein College of Medicine, Fordham University Graduate School of Psychology, and the University of South Alabama School of Medicine, he is the senior author of the highly regarded text The Evaluation and Treatment of Marital Conflict.
Thomas F. Fogarty, MD (deceased), a cofounder of the Center for Family Learning, served on the faculties of Albert Einstein College of Medicine and the Pastoral Counseling Institutes of St. John's University and Iona College. Highly regarded as a creative teacher and clinician, Dr. Fogarty practiced his model of family systems in Westchester County, New York, for more than 40 years. Leo F. Fay, PhD, a retired Associate Professor of Sociology at Fairfield University, now resides in Arizona and serves on the visiting faculty of the Center for Family Learning. He is a coauthor of The Evaluation and Treatment of Marital Conflict.
Judith Gilbert Kautto, ACSW, a faculty member and former Director of Postgraduate Education at the Center for Family Learning, maintains a full-time private practice in Westchester County, New York, and is a coauthor of The Evaluation and Treatment of Marital Conflict.

Series Editor's Note, Michael P. Nichols 1. Relationship Triangles: Evolution of the Concept 2. The Relevance of Triangles in Clinical Context 3. Addressing Triangles in Therapy 4. The Structure of Relationship Triangles 5. Emotional Process within Triangular Structure 6. The Interaction of Structure, Process, and Function 7. Introducing Triangles in Individual Therapy 8. Coaching and Direct Intervention with Triangles in Individual Therapy 9. Extrafamilial Triangles in Marital Conflict 10. Marital Triangles within the Family 11. Child and Adolescent Triangles 12. Symptomatic Child and Adolescent Triangles within the Family 13. Conclusion: Becoming a Triangle Doctor