Mackenzie Jones

Peyton Holowsko is a new provider at PentaHealth Family Practice West Chester! Peyton started at this office three years ago as a Registered Nurse and is now a Nurse Practitioner. Her new role started on May 1^st, 2025, and she is accepting new patients.

Peyton earned a Bachelor of Science in Nursing from La Salle University in 2020. She started her career as an RN in the Surgical Trauma ICU with Einstein Medical Center in Philadelphia. Her pursuit of a Master of Science in Nursing degree began with her undergraduate alma mater in August 2021. The academic program concentration was Family Nurse Practitioner, so Peyton transitioned from acute care to primary care when she came to work for PentaHealth in December 2021. She worked as a full-time RN while participating in La Salle University’s MSN program. Peyton completed the MSN program in December 2024.

Peyton is board certified through the American Academy of Nurse Practitioners. She enjoys listening to patients, teaching them about their health, and cultivating lasting patient relationships. She values the ability to care for the whole family when all are patients of the Family Practice. Peyton has a special interest in working with adolescents and young adults.

When she is not seeing patients, one of Peyton’s favorite things to do is walk the dog with her husband and have a morning coffee in hand. She also enjoys reading, cooking, and traveling, but most importantly she cherishes spending time with her family.

Dr. Hubert Wu joined PentaHealth Family Practice West Chester on May 1^st, 2025. He is accepting new patients.

Dr. Hubert Wu obtained his medical degree at the Philadelphia College of Osteopathic Medicine. He went on to complete his residency at Penn State Health – St. Joseph’s in Family and Community Medicine, where he was elected as Chief Resident during his 3^rd year. Dr. Wu has worked as an Attending Hospitalist on medical/surgical/ICU floors as well as an outpatient primary care provider in a hybrid role, valuing the traditional approach to Family Medicine in both the inpatient and outpatient setting.  

Dr. Wu’s interests span the entire spectrum of primary care. He strives to promote patient’s health with a collaborative and accountable approach. He prides himself on finding ways to individualize his care with each one of his patients.  

He enjoys spending time with family, which includes his three children (and all the chaos that entails) and wife.  

Join us in sending a big congratulations to Dr. Jean Stretton on her retirement! She has dedicated over 40 years to the health and wellbeing of patients in and around the West Chester community. Dr. Stretton was one of the independent primary care physicians who joined together to form Gateway Medical Associates in 1996! Since then, she has largely contributed to building PentaHealth into the organization we are today.

Dr. Stretton has always been a strong advocate for patient centered care, effective communication among health professionals, and coordinated transitions of care. Her compassionate and sincere presence will be missed by patients and our staff. We wish her a well-deserved and relaxing retirement!

We are pleased to welcome Dr. Sadaf Ausaf as a new physician at PentaHealth Internal Medicine West Chester! She is accepting new patients.

Dr. Sadaf Ausaf earned her medical degree from Dow Medical University in Karachi, Pakistan, and completed her internship at the prestigious Aga Khan University Hospital. She then pursued her dream of specializing in Internal Medicine by completing her residency at St. Vincents Medical Center, part of the Hartford HealthCare system in Connecticut.

In 2013, Dr. Ausaf joined Cooper Medical School of Rowan University in New Jersey as an attending physician, where she served on the Hospital Medicine faculty until June 2024. Alongside her hospital work, she also practiced telemedicine with Amwell, providing care to patients in both New Jersey and Pennsylvania. In February 2025, she joined PentaHealth.

Board-certified in Internal Medicine, Dr. Ausaf specializes in treating hypertension, diabetes, and cardiovascular disease, with a strong focus on preventive care and chronic disease management. She has a particular interest in women’s health and community mental health, aiming to enhance the management of chronic conditions.

Beyond medicine, Dr. Ausaf is passionate about early childhood education. She is a pioneer of the Muslim Children of North America (MCNA) program at the Foundation for Islamic Education in Exton. In her free time, she enjoys traveling with her family, practicing yoga, and capturing nature through photography. A lover of art, she has a special appreciation for henna design and calligraphy. Dr. Ausaf resides in the beautiful town of Malvern with her husband and two sons.