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Our Team in West Chester at AFC Urgent Care

AFC Urgent Care & Walk-In Clinic in West Chester, PA, has an Excellent Staff of Board-Certified Physicians, Physician Assistants, Nurse Practitioners, X-ray technicians, and Medical Assistants.

Our highly trained staff have family medicine, emergency medicine, and acute care backgrounds, and are ready to address your medical needs. We are a professional, compassionate, and caring team. Our urgent care center in West Chester contains a full lab and advanced medical technology to ensure you receive the fastest and most accurate treatment possible. Our goal is to bring you the best possible medical care and get you back on your feet quickly. We are here when you need us!


Leonard Sax, MD, PhD, FAAFP

Dr. Sax graduated Phi Beta Kappa from the Massachusetts Institute of Technology (MIT) at the age of 19. He then earned both a PhD in psychology, and an MD, at the University of Pennsylvania. After completing a three-year residency in family medicine at Lancaster General Hospital, Dr. Sax launched his own medical practice in Montgomery County Maryland, just outside Washington, DC, where he practiced for 18 years. He has worked at our center since its launch in October 2015. He is also a DOT-certified medical examiner. Dr. Sax is the author of four books for parents, most recently The Collapse of Parenting, which was a New York Times bestseller. He lives with his wife and daughter near Chester Springs.

Jason Dillinger, PA-C

Mr. Dillinger is a Chester County native. He graduated from Penn State University in 2001 with a dual degree in Real Estate and International Business. After working in Real Estate and mortgages for seven years, he switched careers from business to medicine -first as an EMT and then eventually as a Physician Assistant, graduating with a Master’s in Physician Assistant studies from Barry University in 2013. Additionally, Mr. Dillinger is a DOT-certified medical examiner. Jason has been practicing medicine in an Urgent Care setting since 2014 and considers it a real privilege to be back home with the opportunity to give back to the community he grew up in.

Stephen Spencer, MD

Dr. Spencer is a Pennsylvania native who grew up in the Wilkes-Barre area and graduated from King’s College with a bachelor’s degree in biology. He attendedJefferson Medical College at Thomas Jefferson University in Philadelphia. After obtaining his medical degree, he began his training in Emergency Medicine at the Geisinger Medical Center in Danville, PA. Dr. Spencer has been an emergency physician, practicing in the South Jersey and Philadelphia area since 1999. He was also part owner of an emergency medicine staffing company, Tri-County Emergency Physicians from 2007 until 2020, staffing several departments in the Philadelphia area.He continues to practice emergency medicine at Pottstown Hospital, and has recently joined our team as a part-time physician. We are fortunate to have Dr. Spencer with his extensive background in emergency medicine as the newest member of our team! He currently resides in northern Chester County with his wife and two teen girls. His hobbies include playing guitar/piano (non-professionally) and he loves spending time outdoors mountain biking or hiking.

Julie Rich, MSN, CRNP

Ms. Rich is thrilled to be a member of the AFC team. She was born and raised locally and is a graduate of the Villanova University College of Nursing. She then went on to obtain a Master’s in Science from the University of Pennsylvania. She has worked in emergency medicine for the past 22 years but will often say she has been working in this field since she was 3 years old. In the early 1970’s, her father helped design the NYC EMS system, and he would take her on calls. Julie is passionate about patient advocacy and care coordination. She is also an educator and is on the faculty at two area universities. She lives here locally in Chester County with her husband and two children.

Wendy Peck, MPAS, PA-C

Ms. Peck grew up on the Mainline originally from Wayne, PA. She graduated from Loyola University in 2006 with a Bachelor of Science after studying a year abroad at Newcastle University in the UK. Before obtaining her Master, Ms. Peck volunteered in both South Africa and Guatemala helping underserved communities. In 2014, she graduated from Seton Hill University with a Masters' in Physician Assistant Studies. Wendy worked at the Philadelphia Hand Center until 2015 where she honed her skills in Orthopedics/Hand Surgery. From 2015 until the present she has decided to concentrate in treating people in Urgent Care and is now happy to be part of the AFC Family. She currently lives in Downingtown, PA with her Husband and Daughter.

Lindsay Moore, PA-C

Lindsay is a board-certified Physician Assistant. She graduated with her Master of Science degree in Physician Assistant Studies from Misericordia University. Prior to PA school, Ms. Moore completed her Bachelor of Science degree in Health Sciences at James Madison University. Lindsay has previous experience working in primary care before joining the team at AFC Urgent Care in West Chester. Lindsay is a Chester County native and in her free time enjoys exercising, traveling, and playing with her dog, Olive!

Sierra Mazzarella, MSN, RN, FNP-C

Sierra is a Certified Registered Nurse Practitioner. She completed her Master's of Nursing at DeSales University. Prior to that, Ms. Mazzarella was working as a registered nurse at Reading Hospital. She completed her Bachelor's of Nursing at Indiana University of Pennsylvania. In her free time, Sierra likes to travel, read, and spend time with her husband and 3 dogs. Sierra started working in healthcare because of her passion for helping others achieve their health goals.

Timothy Pancio PA-C

Timothy grew up in upstate New York and went to SUNY Albany for his undergraduate degree, where he majored in biology. Mr. Pancio continued his education in Fort Myers, FL, where he obtained his master’s degree in a physician assistant program. He lived and worked in Florida for 6 years before moving to Pennsylvania to start a family. He has three little kids and loves traveling with them. Mr. Pancio has worked in acute care medicine between urgent care and emergency medicine since 2012 and looks forward to taking care of you and your family in Chester County for years to come! Mr. Pancio currently spends his time working in Chester County Hospital ER and our urgent care center.

Bios—coming soon.....

Amanda Miller, DO

Tamara Connor, MSN, CRNP

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