Campbell has been able to lead the Lions to the NFC Championship Game and is two wins away from leading them to their first Super Bowl in franchise history.
Harbaugh led the Ravens to the top seed in the AFC and also has them within two wins of a Super Bowl.
Ryans led the Texans to the playoffs in his first year as head coach and even won a playoff game during wild-card weekend. He's going to have that team contending for quite a while.
Shanahan led the 49ers to the top seed in the NFC and is in his third straight AFC Championship Game. He's trying to lead them to their second Super Bowl appearance in the last five seasons.
Finally, Stefanski did one heck of a job with the Cleveland Browns. He led them to the playoffs despite numerous players being lost for the season, including star running back Nick Chubb and quarterback Deshaun Watson.
The winner of this award will be announced on Feb. 8.