When the Pittsburgh Steelers hired Karl Dunbar as their defensive line coach in 2018, it was a reunion of sorts between Dunbar and Mike Tomlin and Dunbar and Pittsburgh. Dunbar and Tomlin had coached together when Tomlin was the defensive coordinator for the Minnesota Vikings in 2006, and he hired Dunbar to be his defensive line coach. Dunbar ended up staying through the 2011 season, while Tomlin was off to Pittsburgh in 2007 to take over as the Steelers head coach.
It was also a return to Pittsburgh for Dunbar, as the Steelers made him an eighth-round pick in the 1990 NFL Draft, where he learned under defensive line coach Joe Greene.