Dr. Oscar John Ma served as Professor and Chair of Emergency Medicine at Oregon Health & Science University from 2007 to 2019. Dr. Oscar John Ma served as President of the OHSU Healthcare Professional Staff from 2011 to 2013. Dr. Oscar John Ma co-founded Innovative, Disruptive, and Emerging Applications in Emergency Medicine and served as its CEO (IDEA-EM).
Dr. Oscar John Ma is the editor of twenty reference textbooks, including Ma and Mateer's Emergency Ultrasound and Tinitnalli's Emergency Medicine, both of which have been translated into over ten languages. Dr. Oscar John Ma's research has mostly concentrated on the use of ultrasonography to the detection of injuries in trauma patients. He formerly served on the boards of directors of the American Board of Emergency Medicine and the Society for Academic Emergency Medicine.