 From 1985–1988, he coached under Barry Switzer, a member of the College Football Hall of Fame and Super Bowl winning coach.Donnan coached the legendary Oklahoma Sooner Wishbone Offense, a formation that was perfected by Switzer in 1971 when it shattered the NCAA record for total offense per game and eventually led the Sooners to national championships in 1974 and 1975.Under Donnan, the Wishbone helped the Sooners to impressive 11-1 seasons from 1985–1987, including a national championship in 1985.