After playing for the Tennessee Titans from 2000 to 2006, Sirmon joined the coaching ranks. Spent the 2011 season coaching the linebackers at Tennessee after serving as a graduate assistant in 2010, working with the safeties. Previous stop was at Central Washington as linebackers coach.
Sirmon was hired by Dan Mullen to coordinate Mississippi State’s defense for the 2016 season. He’s considered as one of the nation’s rising stars as a defensive coach.