Cheri L. Marmarosh, PhD, is a full-time associate professor of professional psychology at the George Washington University and a licensed psychologist. She has published numerous empirical and theoretical articles that focus on how group and individual therapy facilitate change. She has supervised the research and clinical work of many doctoral students in the DC area. She is also an associate editor of Group Dynamics: Theory, Research, and Practice and on the editorial boards of the International Journal of Group Psychotherapy and Psychotherapy: Theory, Research, Practice, and Training. Dr. Marmarosh is a faculty member in the Advanced Training Program in the Institute of Contemporary Psychotherapy and Psychoanalysis and on the steering committee of the Couple Program at the Washington Center for Psychoanalysis. She is a Fellow of APA Division 29 (Psychotherapy). Dr. Marmarosh has a private practice in Washington, DC.

Rayna D. Markin, PhD, is an assistant professor of counselling at Villanova University and a licensed psychologist. She has published numerous empirical and theoretical articles on the group therapy process and outcome, with special attention on how attachment and transference impact group member relationships and the group therapy process. She is interested in studying relationship-based psychotherapies, in general, and the curative factors in individual and group therapies. She is also interested in designing attachment-based interventions for at-risk mothers that use a group format. Dr. Markin has practiced in numerous settings, from counselling centres and hospitals to private practice. She is involved in several professional organisations, such as the Society for Psychotherapy Research and APA Division 29. However, she derives the most joy from spending time with her two most precious attachment objects, her husband and young daughter.

Eric B. Spiegel, PhD, is a licensed psychologist in private practice in Philadelphia and Bryn Mawr, Pennsylvania. He enjoys working across therapeutic modalities, offering individual, couples, and group psychotherapy in his practice. Dr. Spiegel has specialty areas in anxiety and mood disorders, attachment and relationship issues, clinical hypnosis, mind-body psychology, and trauma. He is involved in several professional organisations, including the American Society of Clinical Hypnosis (ASCH). In 2012, he was honoured by ASCH with the Early Career Achievement Award. He currently serves as the moderator of the Board of Governors and as a member of the Executive Committee for ASCH. He received his doctorate in counselling psychology from the University of Maryland in 2005.

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