Harrison played alongside fellow Hall of Famer Charlie Davis at Stamford, earning all-district and all-state recognition at center in 1954. He was a part of coach Bud Wilkinson's back-to-back national champions at Oklahoma, and despite weighing only 225 pounds went on to earn all-conference, all-America and UPI College Lineman of the Year honors in 1958 after being stuck behind OU's legendary Jerry Tubbs. "Harrison is the best center I ever saw in college," Tubbs later said. "As a sophomore he was doing everything better than I could -- and asking me how to do things the right way." Harrison spent nine seasons as an NFL linebacker with San Francisco, Philadelphia and Pittsburgh.