Kettering Health Network (Dayton, Ohio). Kettering Health Network includes eight hospitals and more than 120 outpatient facilities across southwest Ohio. It has almost 12,000 employees, including 2,100 physicians. The Seventh-day Adventist Church broke ground on Kettering Hospital, which became the health system's flagship hospital, in 1961. Kettering Medical Center ranked No. 17 among the best hospitals in Ohio in U.S. News & World Report's 2016-17 list. Kettering Health Network was also named one of the 15 Top Health Systems by Truven Health Analytics for 2017.