Muschamp takes over the defensive coordinator position for Gary Gibbs, who accepted a job with the Dallas Cowboys last week. Last year, Muschamp coached the Tiger linebackers with both Trev Faulk and Bradie James earning first team All-Southeastern Conference status after helping LSU to a 10-3 overall mark and the league title.
"Will is one of the brightest young coaches that I've been around in a long time," Saban said. "He mad e a big contribution to our staff last year. His enthusiasm and knowledge of the game was something that I felt we couldn't pass up. He's been a coordinator before, he understands our system and I think it's a great fit."
Prior to joining the Tigers for the 2001 season, Muschamp served as defensive coordinator for Valdosta State.
"I'm appreciative of Coach Saban having the confidence in me and giving me this opportunity," Muschamp said. "It's a great honor to be a coach at LSU and I'm very excited about what we're building here."
Doll comes to LSU from Notre Dame, where he coached since the 1994 season.
While at Notre Dame, Doll served as assistant head coach and helped lead the Irish to five bowl games. Prior to his stint at Notre Dame, Doll coached at Texas A&M for six years, helping the Aggies to five bowl games, including three appearances in the Cotton Bowl.
"I have a great deal of respect for LSU and all that Coach Saban has done there," Doll said. "Having played LSU before while I was coaching at Texas A&M and Notre Dame, I know all about the LSU experience and I'm very excited to become a part of the LSU football program. It really is an honor for me to join Coach Saban's staff.
Doll has also coached at the collegiate level at Arizona State (1985-87), Tulsa (1980-84) , Iowa State (1979) and Wichita State (1975-76).
"I have a great deal of respect for Kirk," Saban said. "He's a great person and an outstanding teacher. He has a reputation as being an outstanding coach and a great recruiter. He recruited the state of Texas with really good results while he was at Notre Dame and that's an area that is very important to us."
Doll, a native of Wichita, Kan., earned Bachelor's degrees from both East Carolina and Wichita State. He played as both a defensive end and tackle at East Carolina for two years.
Doll is married to the former Kathy Reding and the couple has three children – Kate, Kelsey and Kyle.