Mark Lopatin is a rheumatologist who recently retired after 28 years in independent practice. He is active in organized medicine, having served as president and chairman of the Montgomery County Medical Society. He also has served as chair of the Montgomery County Medical Legal Committee and the Montgomery County Task Force on Mediation. He currently serves on the Board of Trustees for both the Pennsylvania Medical Society and their Political Action Committee. He is also an active member of multiple grassroots advocacy groups. He has lectured and written extensively on a multitude of health care issues to educate patients and physicians how health care policies affect the care that patients receive. He lives with his wife, Suzan and his two poodles, Harry Potter and Gryffindor.