PentaHealth at Mount Airy Family Practice is a partnership of board certified family physicians and nurse practitioners. Family medicine is a medical specialty anchored firmly in the biological, clinical and behavioral sciences. We provide continuing, comprehensive healthcare for the individual while emphasizing the health of the family. Family medicine medical providers, like us, provide care for men, women, children and infants - there is no age limit to the patients a family medicine medical provider serves. There is no part of the body, no disease or condition excluded from the family medicine medical provider's care. In every sense, today's family medicine medical provider is what patients throughout history had in mind when they used the term "doctor."  Our primary commitment is to excellence in patient care, we accomplish this with the help of our front desk staff, nurses, and medical assistants.

Our Providers

Kristina Kassis, PA-C

Ms. Kassis is a certified family practice physician assistant who completed her training at the Philadephia College of Osteopathic Medicine. She has worked in family practice and hospital-based settings in New York with an emphasis in family medicine.

Lauren Kummer, MD

Dr. Kummer is a graduate of Temple University School of Medicine, she is interested in women's health, sports medicine, and office procedures. Dr. Kummer sees patients of all ages.

Susan Leath, MD

Dr. Leath graduated from the Medical College of Pennsylvania, she holds a Bachelors Degree from Yale University. She is an active member of local health initiatives in Philadelphia.

David Lewis, MD

Dr. Lewis graduated from Wayne State Univeristy School of Medicine in Detroit. He has a special interest in Dermatology and performs many in office procedures.

Marissa Patterson, CRNP

Ms. Patterson has nursing degrees from Yale and Johns Hopkins and an undergraduate degree from Bryn Mawr College. She has special interest in pediatric and adolescent health as well as gynecology and reproductive care.

Jared Von Arx, PhD

Dr. Von Arx earned his PhD in Clinical Psychology from the University of Virginia. He does psychotherapy and clinical assessments with adults, adolescents, and children, as well as family therapy. He specializes in mental health issues such as depression, anxiety, relationship issues, trauma, and major life transitions.

All of our medical care providers are Board Certified.

We are committed to providing excellent patient care and to serving Philadelphia’s diverse communities.

We continually review and improve processes that impact patient care. In addition to our physicians and nurse practitioner, our registered nurses consult with patients, and are often patients’ first point of contact, ensuring that concerns get addressed quickly.