Our Providers

Our providers maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in the medical field. Read on to learn more about our staff's experience and training.

Michael Stierstorfer, M.D.

Dr. Stierstorfer is the founder of East Penn Dermatology and the IBS Centers for Advanced Food Allergy Testing. He specializes in medical, surgical and cosmetic dermatology. Dr. Stierstorfer graduated Phi Beta Kappa from Franklin & Marshall College and Alpha Omega Alpha from Temple University School of Medicine. He completed his Internal Medicine internship and Dermatology residency at the Dartmouth-Hitchcock Medical Center where he served as Chief Resident. He is a Clinical Associate Professor of Dermatology at the University of Pennsylvania School of Medicine where he supervises dermatology residents in training and was awarded a FacultyTeaching Award in 2008. He is a member of the American Academy of Dermatology, Pennsylvania Academy of Dermatology and Dermatological Surgery, and Philadelphia Dermatological Society. Dr. Stierstorfer pioneered the discovery that hidden food allergies often are the cause of irritable bowel syndrome (IBS) and offers skin patch testing to pinpoint these allergies at the IBS Centers for Advanced Food Allergy Testing in North Wales and in Center City Philadelphia. He has published in a number of peer-reviewed dermatology journals, is a clinical investigator independently and for the University of Pennsylvania, and a participant in the Major League Baseball Skin Cancer Screening and Awareness Program.

Marvin Sasson, M.D.

Dr. Sasson graduated Phi Beta Kappa from Brandeis University and Alpha Omega Alpha from New York University School of Medicine. He completed his Internal Medicine internship at the Hospital of the University of Pennsylvania and his dermatology residency at Washington University in St. Louis. He joined the faculty at Washington University, teaching residents and medical students, before coming to East Penn Dermatology. He is certified by the American Board of Dermatology and is a member of the American Academy of Dermatology, Pennsylvania Academy of Dermatology and Dermatological Surgery, and Philadelphia Dermatological Society.




Stephanie Slaski, MMS,PA-C

Stephanie Slaski, MMS, PA-C, is a welcome addition to East Penn Dermatology, joining the team in September 2018. Stephanie comes to us as a board-certified physician assistant from Columbus, Ohio where she has been practicing dermatology since 2014. Stephanie grew up in Eagleville, PA and earned her undergraduate degree from the Pennsylvania State University where she graduated with a Bachelor of Science degree in Biobehavioral Health with Highest Distinction Honors (We Are!...). She then earned her Master of Medical Sciences degree from Salus University’s physician assistant program in Philadelphia, PA where she graduated Magna Cum Laude. Upon passing her boards, her husband’s career led her to central Ohio, whereby she trained and worked alongside the Midwest’s most well-renowned dermatopathologists, Mohs surgeons, cosmetic and general dermatologists. During this time, she also served as a clinical preceptor for physician assistant students on rotation, while also teaching dermatology to first year physician assistant students at Ohio Dominican University. While she has had the privilege of serving thousands of patients in the Midwest, Stephanie is thrilled to be back home on the East Coast and to have the opportunity to provide dermatological care to the community where she was born and raised.

Stephanie is proficient in diagnosing and treating a myriad of dermatologic disorders among pediatric, adolescent, and adult patients including skin cancer screening, detection, and treatment, eczema, warts, psoriasis, and rashes. Although she loves all aspects of dermatology, Stephanie takes special interest in the treatment of adolescent and adult acne, consciously taking the time to customize and tailor treatment plans, while also addressing each patient’s concerns and goals along the way. In addition to specializing in acne, Stephanie also has a focal interest in performing cosmetic procedures (Botox®, Dysport®, hyaluronic acid fillers, and Kybella®) with an emphasis on providing natural results. She takes great pride in practicing by the mantra that “the best cosmetic treatment is undetectable and keeps you looking like you”. Whether you are struggling with acne, are due for a skin check, or have questions about general skin care, Stephanie is passionate about her patients and their concerns, and is committed to providing the highest level of dermatological care within a pleasant and compassionate environment.

When not practicing medicine, Stephanie enjoys weekends in Avalon (under an umbrella, of course), Penn State football, horseback riding, Pilates, traveling with her husband, and spoiling her cat. She truly loves her career as a dermatology physician assistant and looks forward to meeting you and catering to your needs wherever you may be in your dermatological journey.

Contact Us

East Penn Dermatology, P.C.
1140 Welsh Road, Suite 130
North Wales, PA 19454

Phone (215) 661-0300
Fax (267) 642-9089