Robert H. Klein is a clinical faculty member in the School of Medicine at Yale University, USA. He is a Fellow of the American Psychological Association and Diplomate in Group Psychology, as well as Past President and Distinguished Life Fellow of the American Group Psychotherapy Association. A recognized expert in the area of group psychotherapy and group dynamics, he lectures, consults and supervises both nationally and internationally. He is editor/author of six books and maintains a private clinical practice with offices in Westport and Milford, CT. Victor L. Schermer is a psychologist based in Philadelphia, PA, USA. He is a Life Fellow of the American Group Psychotherapy Association. He is author/editor of eight books and over 50 articles about psychotherapy and group dynamics, and is a frequent presenter of lectures and workshops internationally.