Ohio Northern University is a private, United Methodist Church-affiliated university located in the United States in Ada, Ohio, founded by Henry Solomon Lehr in 1871. ONU is accredited by The Higher Learning Commission and the North Central Association of Colleges and Schools. ONU is a sister university with Dankook University, a private university in Seoul, South Korea. In 2008, U.S. News & World Report listed Ohio Northern as the second-best comprehensive college in the Midwest. The university comprises five colleges: Prior to 1973, the law school was known as "the Warren G. Harding College of Law". It was renamed in honor of Claude W. Pettit, a judge and former dean of the college. Henry Solomon Lehr, a former soldier in the American Civil War, became the schoolmaster for the Ada public school in 1866. Lehr began offering additional courses in the evenings to motivated students to cover topics beyond the standard curriculum. After five years, he approached the town about starting a college.