A.T. Still University School of Osteopathic Medicine in Arizona (ATSU-SOMA) is an osteopathic medical school in the United States granting the Doctor of Osteopathic Medicine degree. Established in 2007, ATSU-SOMA is located at the Mesa, Arizona campus of A.T. Still University. A.T. Still University (ATSU) is the original founding institution of osteopathic healthcare, established in 1892 by Andrew Taylor Still in Kirksville, Missouri.