The Oregon football team switches uniforms like most people flip channels. But in one area the Ducks are singularly static: Their coaching staff is the only one in major-college football unchanged since 2009.

Coach Chip Kelly is a relative newcomer at Oregon, entering his sixth season including two years as offensive coordinator. Three of his assistant coaches are heading into their fourth seasons. But six of Oregon's assistants have spent 10 or more years at Oregon, and one—running backs coach Gary Campbell—has been there...