 Prior to coaching at Memphis, he was the defensive coordinator at Mississippi State from 1996 to 2002.In 1995, he served as the defensive coordinator at Arkansas, helping the Razorbacks win their first SEC Western Division championship that season.In 1999, while serving as defensive coordinator and linebackers coach at Mississippi State University, Dunn was a finalist for the Broyles Award, given annually to the nation's top college football assistant coach.