Lou Saban coached the Denver Broncos from 1967–1971. He came to the Broncos (with a stop in Maryland) after having helped the Bills to consecutive AFL championships.
But ultimately, Saban's impact with the Broncos was not what had been hoped, as noted in Zappa's recent interview with firstfan, excerpted here:
How instrumental was Lou Saban to turning around the 60's Broncos?
Lou was responsible for turning the team around and for laying the foundation for the success of the mid and late seventies. The tenure of Lou Saban was a double-edged sword. Lou had started with the inception of the AFL as the coach of the Boston Patriots. He was lured to Buffalo in ‘63 and led Buffalo to consecutive championships in ’64 and ’65. He did indeed do all of the things I mentioned, but his inability to make the Broncos a winning team gave fuel to the east coast media fire that not even the great Lou Saban could make a winner out of those Denver jackasses. There is no doubt that there would never have been the ‘77/’78 Superbowl appearance without Lou Saban, but the east cost bias was validated.
While it is small solace, it should be noted that Saban's Broncos suffered through an unfortunate spate of injuries -- SI noted that in 1968, the defense was on the field for around 65% of the plays. Even so, he brought us the team that put the great Floyd Little on the map, a player and a time considered by many to be instrumental to saving the team from relocation.
Saban's time in Denver was also notable for giving the start (due to a succession of injuries at the QB position) to an African American QB, Marlin Brisco, for the first time in league history.
Saban went on to rejoin the Bills, helping OJ Simpson become the force he was. Later, he coached the U of Miami and is widely credited with recruiting Jim Kelly and putting the U on the track to its future success.
Hats off to Lou, and thanks.