Kelly is a graduate of Milton-Union High School in West Milton, Ohio, and Manchester College in North Manchester, Indiana. He played both quarterback for the football team and catcher for the baseball team at Manchester College. He received a bachelor's degree in physical education and health from Manchester College. In total wins, Kelly ranks 20th all time with 246. He was the second fastest coach in NCAA history to reach 200 wins. Kelly accomplished the feat in 242 games—second only to Jake Gaither who reached the 200-win level in 240 games.