Leslie S. Greenberg, PhD, is Distinguished Research Professor Emeritus of Psychology and founder and former director of the Emotion-Focused Therapy Clinic at York University in Toronto, Canada.

Jeremy D. Safran, PhD, until his death in 2018, was Professor of Psychology at the New School for Social Research, where he served for many years as Director of Clinical Training, and Senior Research Scientist at New York's Beth Israel Medical Center. A renowned psychotherapy researcher, clinician, teacher, and mentor, Dr. Safran was past president of the International Association for Relational Psychoanalysis and Psychotherapy. He was a recipient of honors including the Senior Distinguished Research Career Award from the Society for Psychotherapy Research and the Scholarship and Research Award from Division 39 of the American Psychological Association.