Joseph makes the seventh coach to depart the staff this offseason and had been Dooley's right-hand man dating back to their days together at Louisiana Tech.
Joseph's defensive secondary helped the Vols finish among the nation's top 20 with 18 interceptions in 2010.
The New Orleans, La., native coached on Dooley's staff at Louisiana Tech for three seasons. Joseph helped turn around a Bulldogs secondary unit that sliced its scoring defense average nearly in half by 2008, the same year Tech won its first bowl game in 30 years at the Independence Bowl.
Joseph, 37, joined Dooley at Tech after one graduate assistant season at LSU, where he worked under head coach Les Miles and defensive coordinator Pelini.
Before that, Joseph gathered knowledge of the Louisiana high school football circuit — especially south Louisiana — thanks to his three seasons each as an assistant coach at both Archbishop Shaw and Destrehan high schools in the New Orleans area. Joseph was at Archbishop Shaw from 1999 through 2002, and then at Destrehan through 2005.
Joseph earned his bachelor's degree from Northwestern State in 1996. He was the 1995 Southland Conference Baseball Player of the Year and went on to four minor league playing seasons in the Chicago Cubs and San Diego Padres systems.
Dooley will likely move quickly with a replacement given that the Volunteers open spring football later this month. In the mean time, newly hired Derrick Ansley is the lone coach in the secondary.
Dooley's only holdovers from his original coaching staff on The Hill consist of Jim Chaney and Darin Hinshaw.