Ronnie Bull played running back/half-back at Baylor University wearing jersey #25 from 1958-1961. While at Baylor he played at the Gator bowl against the University of Florida. He also played in the east-west shrine game, senior bowl, and college all-star game.

Bull was drafted in the 1962 American Football League Draft by the Dallas Texans with the team's first pick, but elected to play for the National Football League instead. Bull was taken out of the Baylor University by the Chicago Bears as the seventh pick in the first round. He would play for the Bears wearing jersey #29 and Philadelphia Eagles wearing jersey #47. During his career, Bull would play in 123 games, carry the ball 881 times for 3,222 yards and 9 touchdowns. He would be named the 1962 Senior Bowl most valuable player and 1962 UPI NFL-NFC Rookie of the Year. Ronnie was among the inaugural inductees in the Texas High School Hall of Fame in 1985. He was also inducted into the Chicagoland Sports Hall of Fame in 2001.

He currently runs his specialty advertising business, Ronnie Bull Sales, Inc in the Chicago suburb of Bolingbrook. Ronnie Bull Sales, Inc