Midwestern University is a private medical and professional school with campuses in Downers Grove, Illinois and Glendale, Arizona. As of the 2020-21 academic year, a total of 2,987 students were enrolled at the Downers Grove campus and 3,902 were enrolled at the Glendale campus. Founded in 1900 as the American College of Osteopathic Medicine and Surgery, the Chicago College of Osteopathic Medicine is the fourth-oldest medical school currently active in Illinois. Over the years, the university expanded, adding additional degrees and programs; in 1993, the school united these programs under the name Midwestern University. In 1995, the school opened a campus in Glendale, Arizona, becoming the second and largest medical school to teach students in the state. The university is accredited by the Higher Learning Commission and the medical schools are also accredited by the American Osteopathic Association's Commission on Osteopathic College Accreditation.