You may recall that when Mike McCarthy first took over the Dallas Cowboys that his staff featured plenty of people who had been head coaches before. Mike Nolan had been the head coach of the San Francisco 49ers and McCarthy actually worked on his staff. Jim Tomsula, the defensive line coach, had also been the skipper for San Francisco, albeit for a brief cup of coffee.
John Fassel joined as special teams coordinator, and while he had never been a head coach before, he did serve as the interim head coach for the Los Angeles Rams in their first season back in L.