Background
Mary Callsen, M.D., practices internal medicine at Johns Hopkins Community Physicians Downtown Bethesda. She received her medical degree from The Ohio State University College of Medicine, and completed her residency in internal medicine at Brooke Army Medical Center in San Antonio, Texas. Dr. Callsen is board-certified in internal medicine and critical care medicine. In 2014, Washingtonian magazine recognized Dr. Callsen as one of the area’s “Top Doctors.”