Phelps has trained under Bob Bowman since he was 11 years old.[190] Bowman swam for Florida State University from 1983 to 1985.[191] Phelps has said Bowman reminded him of a drill sergeant because of his disciplined and regimented ways.[192] However, Phelps has said, "Training with Bob is the smartest thing I've ever done ... I'm not going to swim for anyone else."[193] After the 2004 Summer Olympics, Bowman was hired as the head coach for the University of Michigan after Jon Urbanchek retired. Phelps joined Bowman at Michigan to train and attended classes, but did not pursue a degree.[194][195] Phelps served as a volunteer assistant coach at Michigan.[196] After the 2008 Summer Olympics, Bowman returned to Baltimore as CEO at the North Baltimore Aquatic Club. Phelps also returned to Baltimore with Bowman.[