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A team of doctoral level professionals with expertise teaching group processes designs an experience for your organization in real time.


Jeffrey F. Wolper, Ph.D., founder and director of The Wolper Institute for Group Learning, is a licensed psychologist with more than 35 years experience teaching and providing corporate consulting.

The Leadership and Authority Workshop is Dr. Wolper’s flagship program, which he regularly teaches for the United States Department of State at the Foreign Service Institute as well as a variety of private corporate groups and educational institutions.

He has also designed related courses such as Team Development and Leadership, and Group Dynamics. As a result of the program’s success, Dr. Wolper received an invitation to bring his program to the United States Consulate in Frankfurt, Germany January 24-27, 2017.

Dr. Wolper has been teaching Group Dynamics at The Wharton School of Business for more than 30 years and is director of the Group Process Course at the Lauder Institute at the Wharton School of Business, where all new students start their tenure by taking his course.

He also teaches the course at The Tuck School of Business at Dartmouth. Dr. Wolper earned his Ph.D. and MS degrees at The University of Pennsylvania and completed his undergraduate degree at La Salle University.


Deborah Kossmann, Psy.D.

Deborah Kossmann, Psy.D. is a clinical psychologist who has been in private practice with offices in Langhorne and Haverford, PA since 1989.

Dr. Kossmann earned her B.A. in English in 1982 from Arcadia University, an M.Ed. in Counseling from Temple University in 1989 and an M.A. (1993) and Psy.D. (1994) from Widener University. Prior to earning her psychology degrees, Dr. Kossmann worked in marketing and public relations at the Philadelphia Zoo and KYW Newsradio.

She has been an adjunct professor in the graduate counseling programs at both Chestnut Hill and Rosemont Colleges and has led trainings and workshops on a variety of topics. She was an alumni trustee on the board of Arcadia University for five years.

She is currently a Fellow of the Pennsylvania Psychological Association (PPA) and served for six years on the Board of the Pennsylvania Psychological Foundation (PPF), a charitable arm of PPA. She continues to serve on the PPF Education Award Scholarship Committee and is currently a member of PPA’s Ethics Committee.

Dr. Kossmann is also a Member of the Philadelphia Society of Clinical Psychologists. Her articles and poetry have won awards and have appeared in national publications including The New York Times and The Psychotherapy Networker.

Hope Riley, Ph.D.

Hope Riley, Ph.D. is a licensed psychologist in private practice with more than 35 years experience teaching Group Processes. Her expertise teaching about the invisible rules that govern behavior teach clients to generate behavioral options which increase group performance and personal power to achieve goals.

Dr. Riley teaches Group Dynamics at US Department of State Foreign Service Institute, The Lauder Institute at Wharton, and The Tuck School of Business. Additional faculty positions have included the University of Pennsylvania Graduate School of Education, The Wharton School, The Philadelphia University of the Arts, and the Wyoming Valley Family Practice Residency Program.

She is co-founder of Seismic Consulting Group where she trains managers to increase productivity by accessing and harnessing their organization’s most powerful resources.

Dr. Riley received her BA degree from Dickinson College, and her Masters and Doctorate degrees from the University of Pennsylvania. She is a graduate of the Family Therapy Institute of Philadelphia and is certified as an EMDR therapist.

Howard Friedman, Ph.D.

Howard A. Friedman, Ph.D., is a psychologist, in private practice of psychotherapy & organizational consultation. He serves as an adjunct instructor at New York University, Dept. of Applied Psychology. He is a member of the LGBT Study Group at the William Alanson White Institute, and of the Eastern Group Psychotherapy Society.

Dr. Friedman worked in the New York City public schools for 32 years, where he helped start a school and worked as a teacher, school psychologist, and school change facilitator.

He is Past President of the NY Center for the Study of Groups, an affiliate of the A.K. Rice Institute for the Study of Social Systems (AKRI) and is a Fellow of AKRI. He and his wife have two adult children and live in Manhattan.

Jennifer Lee, Ph.D.

Dr. Jennifer Lee is a Clinical Psychologist and Visiting Assistant Professor of Psychology at Soka University in Southern California. She teaches and mentors students in the social and behavioral sciences, and she designed an experiential course on group dynamics for the undergraduate program.

Dr. Lee has been actively involved with the group relations community for the past 15 years. She is a certified group consultant with the A.K. Rice Institute for the Study of Social Systems and has consulted at conferences both nationally and internationally.

She earned her undergraduate degree from Cornell University and her doctorate in clinical psychology from Teachers College, Columbia University.

Matthew Graziano, MSW, Ph.D.

Dr. Graziano is an Assistant Professor in the Department of Psychology and Family Therapy at Seton Hall University. His clinical work includes group psychotherapy interventions, comprehensive neuropsychological evaluations, as well as large scale clinical and educational interventions with children, adolescents, emerging adults, and adults.

Dr. Graziano uses methods of Narrative Analysis in his research, which has been presented at conferences nationally and internationally. His work has been published in the journals Narrative Inquiry and The Journal of Homosexuality.

His clinical service includes Baruch College, the Chapin School, the Child Mind Institute, the Department of State, Foreign Service Institute, the Hudson County- New Jersey Public School System, the Knowledge is Power Program (KIPP) Charter Schools, New York University, the Rutgers University Institute for Children and Families, and the School at Columbia University.

Dr. Graziano holds his Bachelor of Arts in English, Art History, and Humanities from the University of Colorado at Boulder; Master of Social Work from Rutgers University-New Brunswick; and his Doctor of Philosophy in Counseling Psychology from New York University. He is a licensed psychologist in New York and New Jersey.

Marc R. Kossmann, Psy.D.

Dr. Marc Kossmann is a clinical psychologist licensed in Pennsylvania, New Jersey, Delaware, Virginia, West Virginia, North Carolina, South Carolina, Kentucky, and Michigan. He provides clinical services in these states via the Doctor On Demand telemedicine platform.

Dr. Kossmann works with adults on a number of different specialty areas including goal planning, life transition, stress management and Mindfulness Based Stress Reduction. His expertise in group process roots back to graduate school.

He also continues to study various methodologies for teaching group processes and participates through teaching at the Foreign Service Institute at the United States Department of State.

He obtained his doctorate in psychology from The Institute for Graduate Clinical Psychology at Widener University and has worked with multiple groups on developing leadership and authoritative skills since joining the Wolper Institute team. Dr. Kossmann is bilingual in English and Italian.

Nan Schiowitz, Ph.D.

Dr. Schiowitz is a licensed psychologist with over thirty years of clinical experience. She is a founding member of the The Brandywine Center, a private practice group in Wilmington Delaware, where she provides individual and group therapy, workshops, and consultation.

She applies her own special blend of accelerated dynamic and interpersonal therapy methods, warmth and humor to her work with clients. Her passion for group work began at the University of Pennsylvania where she developed her expertise, and began consulting to Wharton and Graduate Education Students enrolled in the Group Process course.

Additional training in Systems Centered Therapy honed her skills in using group-as-a-whole interventions to help group members learn about authority and responsibility, build connection, and learn about themselves in relation to unconscious group dynamics.

Dr. Schiowitz received her Ph.D. and M.S. degrees from the University of Pennsylvania, and a BS in Social Work from Cornell University.