Dr. Stumacher was born and raised in Lower Merion. He is a graduate of the University of Pennsylvania School of Medicine and completed his residency in internal medicine at the Hospital of the University of Pennsylvania in 2006.
After practicing in the Main Line Health System for 12 years, Dr. Stumacher opened his concierge internal medicine practice in September 2018. He is on staff at Lankenau Hospital and Bryn Mawr Hospital. He has been named a Top Doctor in Main Line Today Magazine since 2010 and Philadelphia Magazine since 2018.