A.T. Still University of Health Sciences (ATSU) is a non-profit, private, graduate school focusing on health sciences, as well as the world's first osteopathic medical school. Founded in 1892 by Dr. Andrew Taylor Still, the school is based in Kirksville, Missouri, United States, with a second campus in Arizona. ATSU is accredited by the Higher Learning Commission of the North Central Association of Colleges and Schools.