The Ohio Athletic Conference (OAC) was formed in 1902 and is the third oldest athletic conference in the United States. Its current commissioner is Tim Gleason. Former commissioners include Mike Cleary, who was the first General Manager of a professional basketball team to hire an African American head coach, and would later run the National Association of Collegiate Directors of Athletics (NACDA). The Ohio Athletic Conference competes in the NCAA's Division III. Through the years, 31 schools have been members of the OAC. The enrollments of the current ten member institutions range from around 1,000 to 4,500. Member teams are located in Ohio.