The Team
Benny
The Heart of Riddle Psychiatry
We’re thrilled to introduce the furriest member of the Riddle Psychiatry team: Benny! Benny is a one-year-old Cavapoo and the beloved pup of our office manager, Melanie—but more importantly, he’s quickly become the soul of our space.
Affectionate, playful, and full of charm, Benny is here Monday through Friday to welcome you with a wagging tail and maybe even his favorite toy. While he may not have an official therapy dog title, he’s everything you’d want in one—offering comfort, joy, and an occasional cuddle just when you need it most.
Feeling anxious or having a tough day? Benny's mission is simple: make you smile. Whether it’s a quick hello or a game of fetch, his presence adds a special kind of warmth to our practice. Come say hi to Benny—our official office greeter and unofficial mood booster. 🐾💛
Raman Gopalakrishnan, MD
Dr. Raman is originally from Bombay, India. After completing Medical school & Psychiatry Residency at Grant Medical College, he moved to the US in 1999.
He trained in Psychiatry at Albert Einstein Medical Center in Philadelphia and earned a Master’s degree in Pharmacology from Thomas Jefferson University. He is Board Certified in Psychiatry & Addiction Medicine.
He worked for four years at Penn Presbyterian Dual Diagnosis Unit. He started Riddle Psychiatry in 2012, where he continues to specialize in the management of Psychosis, Mood Disorders, Anxiety & Addiction. He and his family have lived in Delaware County for over 20 years. He loves teaching, traveling, music and is a die-hard Bruce fan.
Erin Walsh, PMHNP
Erin completed a Bachelors in Psychology from University of Central Florida and a Bachelors in Nursing from Ohio University. She worked in a variety of settings as a registered nurse including skilled nursing, acute care & critical care.
She completed her Masters degree in Psychiatric-Mental Health Nursing from Wilkes University. She resides in Southern New Jersey and can be found at the park with her family, taking barre classes, or reading a book from the library.
Yamah Mator, PMHNP
Yamah earned a Bachelor of science in Nursing at Holy Family University in 2016 in Pennsylvania.She worked in multiple settings namely med-surg, telemetry, mental and behavioral health with adults, adolescents & older adults.
She received her Master’s in Psychiatric Mental Health Nurse Practitioner at Wilkes University in 2023. She is a licensed and board certified Psychiatric Mental Health Nurse Practitioner.
Cate Griffin, PMHNP
Cate received her Bachelors in Nursing from the College of Saint Scholastica in Duluth, MN. As a nurse, she has experience in both behavioral health and women's health. She is the newest member of the Riddle Psychiatry family!
She completed her Masters program at the University of Nebraska Medical Center College of Nursing, and has prior experience in the outpatient setting--formerly working for Crozer Chester Psychiatry. In her free time, you can find her cooking, traveling, or exploring Philadelphia where she lives with her husband and two children.
Betsy Stratton, MA
Betsy Stratton has over 20 years of experience as a licensed clinical psychologist in Pennsylvania. She earned a Bachelor of Science degree in Individual and Family Studies from Penn State University and a Masters of Arts in Clinical Psychology from West Chester University.
She has extensive experience in the mental health field having worked in both inpatient and outpatient settings. She worked in the Social Rehabilitation Program and Outpatient clinic at Hall-Mercer Center of Pennsylvania Hospital before becoming the Director of Psychiatry at Mercy Fitzgerald Hospital. Betsy has consulted for hospitals nationwide on operations and delivering and measuring quality care.
Her practice focuses on individual and couples psychotherapy. She works to establish a safe and trusting environment and uses a variety of approaches, including psychodynamic and family-systems strategies, to help clients achieve their best possible outcomes.