Member association founded in 1897 that represents osteopathic physicians (DOs). AOA serves as the primary certifying body for DOs and is the accrediting agency for all osteopathic medical colleges and health care facilities. AOA’s mission is to advance the philosophy and practice of osteopathic medicine by promoting excellence in education, research, and the delivery of quality, cost-effective health care within a distinct, unified profession. AOA stands firmly behind osteopathic physicians’ ethical and professional responsibilities to patients and the medical profession.