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Therapist Bios

PGSC Staff

The staff of Princeton Group Support Center is comprised of mental health professionals and administrative personnel. Each team member of PGSC contributes their own special skills to the center. We are proud to be the home of such a dedicated and compassionate staff.

Keep on reading to learn more details about our therapists, office manager, billing manager, and consulting psychiatrist.


Ready to make an appointment? Call 908-431-5254 or e-mail info@princetongroupsupportcenter.com!

Charles Leighton, LCSW, CGP
Founder and Director of Princeton Group Support Center

Charles Leighton is a licensed Clinical Social Worker,  Certified Group Psychotherapist, Certified Yoga teacher, certified CBT therapist (pending), and mindfulness instructor.  He has been in private practice for over 20 years with offices in Skillman, New Jersey, and, until recently, at Beth Israel Medical Center in New York City where he was the founder/Director of  "The Heart Group",  a therapy and lifestyle change program for people with heart disease and cancer. His work has been featured in two documentaries, THE MYSTERIOUS HUMAN HEART on PBS and Heartfelt on The Sanofi Channel. Leighton was a senior trainer for The Dean Ornish Program for Reversing Heart Disease and has lectured extensively on mental illness and stress, conducted published research on the effects of anger, and written articles for scholarly journals. He has  been a consultant to such organizations as The New York Times, New York Hospital, Gilda's Club, Smith Center for The Healing Arts, and The Preventive Medicine Institute.  In addition to helping clients resolve their particular presenting problems, he is committed to fostering lifestyle change and skills which we now know are essential for achieving lasting happiness.

“Our mission at The Princeton Group Support Center (PGSC) is to provide individual and group centered support and counseling, stress management (yoga and mindfulness training), and lifestyle management for a wide variety of conditions including anxiety, depression, chronic illnesses such as heart disease and cancer, adolescent issues, and PTSD and other diagnoses, for the purpose of helping individuals lead a happier and more fulfilling life long after they have left PGSC.”

To make an appointment with Charles, please call (908) 431-5254 or email Charles@princetongroupsupportcenter.com.



Peg Cummings, MA, ED.S, LPC, NCC

Peg has over 30 years of experience as an educator and counselor, working with children, adolescents and young adults in schools, summer programs and in private practice. Peg received her Bachelor of Arts degree in Special Education and a Masters of Arts degree in School Counseling from Glassboro State College, as well as an Educational Specialist degree in Marriage and Family Therapy from The College of New Jersey. As a Nationally Certified and New Jersey State Licensed Professional Counselor, and Certified Personal Fitness Trainer, Peg is a strong advocate for improving one’s overall health through evidence based psychotherapy, mindfulness techniques, cognitive behavioral therapy and exercise. 

To make an appointment with Peg, please call (908) 431-5254 or e-mail Peg@princetongroupsupportcenter.com


Beth Doherty, MA, ED.S, LAC

Beth Doherty is a licensed psychotherapist with an M.A. in Mental Health Counseling and an Ed.S in Professional Counseling from Seton Hall University.   She has received extensive post-graduate training in Bioenergetic Analysis and Core Energetics, specific forms of body-psychotherapies based on continuity between mind and body.  In addition to PGSC, she has worked at Corner House, a substance abuse counseling center and Trinity Counseling Center in Princeton, NJ.  She provides individual and group therapy to adults, as well as to couples, families and adolescents.

Beth’s area of expertise is in working with trauma, an often-overlooked aspect of emotional pain that shapes many present day issues. In her work, she uses a body-mind approach (through a focus on breathing, grounding, self-expressive movement, and relaxation) to help clients connect with their deeper feelings and needs. She believes that words alone cannot heal trauma, and that many concerns such as PTSD, ADHD, addiction, anxiety, depression, worry, boredom, confusion, and relationship struggles have a physiological basis. Beth uses her body-based training and relationship counseling to intuitively help clients find relief from their symptoms, reclaim pleasure in their lives, discover their creative source, and learn new ways of relating to others.

To make an appointment with Beth, please call (908) 431-5254 or e-mail beth@princetongroupsupportcenter.com

Joan Dawson, LCSW

My years of experience as a therapist have taught me the value of using an integrative approach when working with individuals, couples, families and groups. Through supportive communication, my clients and I work together to identify priorities, and then create a plan that helps them make positive changes. I specialize in helping teens and adults manage symptoms related to: anxiety, depression, women's issues, eating disorders, personality disorders and trauma. By teaching Dialectical Behavior Therapy (DBT), Cognitive Behavior Therapy (CBT), mindfulness and grounding skills, my clients feel more confident, more connected to others, and more content in their everyday lives.

My experience includes counseling at-risk teens, women in crisis, and diagnosis related to mood and anxiety, eating disorders, trauma, addiction and personality disorders. I have extensive training in trauma, mood and anxiety disorders, women's issues and eating disorders. I am also intensively trained in Dialectical Behavior Therapy (DBT).

To make an appointment with Joan, please call (908) 431-5254 or e-mail joan@princetongroupsupportcenter.com


Shashi Khanna, LCSW

As an accomplished therapist (LCSW) with over a decade of experience I provide integrative therapy, counseling, and education in individual and group settings. If you are a teen, young adult or adult trying to cope with and recover from trauma, depression, anxiety, addiction or relationship issues, It would be a privilege to help you resolve these complex issues.

With certifications in SMART Recovery and Bowen family systems, my specialty is helping clients with ADHD, bipolar disorder, depression, addiction, and anxiety disorders through a combination of evidence-based therapies such as Dialectical Behavioral Therapy (DBT), Cognitive Behavioral Therapy, and place a strong focus on lifestyle/stress management, and mindfulness.

To make an appointment with Shashi, please call (908) 431-5254 or e-mail shashi@princetongroupsupportcenter.com


Dr. Nesrin Hisli Sahin, PhD in Clinical Psychology

Nesrin Hisli Sahin has worked for more than 30 years as a professor of Clinical Psychology and for more than 25 years as a Psychotherapist. She has served as the President of the Turkish Psychological Association for 6 years and as the Coordinator of the Clinical Psychology Division of the Association for another 6 years. She is a registered EuroPsy Specialist in Psychotherapy and currently holds a N.J. Temporary Permit for the Private Practice of Psychology. She is currently teaching as a part-time adjunct professor at the Fairleigh Dickinson University.

Nesrin’s areas of specialty are stress- related psychosomatic and psychological problems, stress-management, depression, anxiety, trauma, resiliency, motivational interviewing, interpersonal neurobiology, mindfulness, relaxation and mind-body medicine. She has conducted extensive research and has several scientific publications in these areas. She has also taken several CE courses on the mentioned topics from the Harvard University Mass. Gen. Hospital Benson-Henry Institute of Mind-Body Medicine, Mass. Gen. Psychiatry Academy, UCLA Extension, PESI, Mindsight Institute, NICABM, Psychotherapy Networker, and the Commonwealth Educational Seminars. Her individual and group psychotherapy orientation is a combination of cognitive-behavioral, brain and attachment based therapies and psycho-education. In the recent years, she has developed her own unique approach named Brain-Based Mindfully-Managed Stress Counseling. Her educational and psychotherapeutic philosophy is to be a good role model, through continuous learning.

To make an appointment with Nesrin, please call 908-431-5254, or e-mail nesrin@princetongroupsupportcenter.com



 Dr. Jennifer Dismukes

 Dr. Dismukes is our consulting psychiatrist on site. She is available for psychopharmacologic consultation. Dr. Dismukes is  board certified in child, adolescent, and adult mental illness and  addictions, and has 16 years experience









Kate Eick, Office Administrator & Intake Coordinator


We know that reaching out for counseling can be a daunting process. Kate is probably the first person you will speak to when you call PGSC for an appointment, and she has that rare ability to help efficiently address your questions and concerns while always maintaining a positive and compassionate attitude.

To speak with Kate, please call (908) 431-5254 or e-mail kate@princetongroupsupportcenter.com.




Carolyn Wallace, Billing Manager

Carolyn Wallace is the Billing Manager for Princeton Group Support Center. Carolyn brings 30 years of medical billing experience to our practice. She received her Bachelor of Science degree in Business Administration from Wagner College. If you find understanding your medical insurance and claims processing to be a daunting task, you're not alone. Carolyn's here to help you navigate through it.  Please reach out to her if you have any questions regarding your claims or mental health benefits.

To speak with Carolyn, please call (908) 431-5254 or e-mail carolyn@princetongroupsupportcenter.com.