The Pittsburgh Steelers once had three former head coaches on their staff as coordinators or position coaches. Under Mike Tomlin, he had Dick LeBeau as defensive coordinator, Todd Haley as offensive coordinator, and Mike Munchak as offensive line coach at the same time.
His current staff isn’t quite that established, but he does have one former head coach under him—for now. That’s of course Brian Flores, his “senior defensive assistant”, who has already been linked to numerous posts for both head coach and defensive coordinator this offseason. There’s a very good chance they lose him after just one season.