Urban was only at Utah for two years - guy was/is absolutely the definition of a climber. But he also changed football there from being competitive with BYU (but slightly behind) into a team markedly ahead of us (and that we haven't beat in the entire lifetime of some deacons!).
Whether you personally like or dislike the man (and there's plenty of reason to dislike), Urban is proof of how a guy can change a program's fortunes in a very short stint.