The American Osteopathic Association (AOA) is a professional organization representing the interests of the nation's 145,000 osteopathic physicians and medical students. The AOA was founded in 1897 and is headquartered in Chicago, Illinois. The organization's mission is to promote the practice of osteopathic medicine, advance the quality of patient care, and advocate for the rights of osteopathic physicians. The AOA offers a wide range of services to its members, including continuing education, professional development, and advocacy. The organization also publishes a number of journals and other publications related to osteopathic medicine and health care. The AOA is governed by a board of trustees and has a membership of over 145,000 osteopathic physicians and medical students.