In 1989, Oklahoma was placed on probation by the NCAA amidst several scandals involving Oklahoma players, including Charles Thompson's arrest for soliciting cocaine to undercover FBI agents. In that same year, after sixteen years as Oklahoma's head coach, Switzer chose to resign. Switzer succeeded in getting the better of several famous contemporaries, including a 12–5 mark against Tom Osborne, 5–3 against Jimmy Johnson, 3–0 against Bobby Bowden, 3-0-1 against Darrell Royal and 1–0 against Joe Paterno, Bo Schembechler, and Woody Hayes. Along with Bennie Owen, Bud Wilkinson, and Bob Stoops, he is one of four coaches to win over 100 games at the University of Oklahoma. No other college football program has had more than three coaches accomplish such a feat.