 Donnan coached the legendary Oklahoma Sooner wishbone offense that helped the Sooners to three consecutive 11–1 seasons from 1985–1987, and a national championship in 1985.In 1986, the Sooners scored 508 points, which at the time was the second highest point total in the school's storied history, trailing only the Sooners 1971 NCAA record setting rushing offense that scored 534 points.Donnan was head football coach at Marshall University, where he led the Thundering Herd to a 64–21 record from 1990 to 1995, including five consecutive 11-plus win seasons, four championship games, and the 1992 NCAA Division I-AA national football championship.