Dr. O John Ma is a highly accomplished medical professional with more than three decades of experience in the industry. He has held numerous research opportunities, studies, and advancements in hospital team leadership. His first position was as a member of the University of North Carolina Hospitals' attending staff in Chapel Hill. John Ma immediately assumed the position of medical director at Carolina Air Care. Within a year, he was appointed director of emergency ultrasonography and residency research director in the Department of Emergency Medicine.