A two-time All-American and a three-time All-SEC selection as a player at Auburn, Rocker was named SEC Player of the Year during his senior season. He finished his career with 354 tackles, including 21 quarterback sacks and 48 tackles for loss. During his tenure, Auburn won a pair of league titles, and Rocker was voted to the school's Team of the Century in 1993. In 2004, Rocker was inducted into the College Football Hall of Fame.
Rocker returned to Auburn to complete his undergraduate degree in 1992 and began his coaching career with the Auburn High SchoolTigers the same year. After serving two seasons as defensive coordinator at the school, he spent three years as a defensive line coach at West Alabama (1994–96).
Prior to his stint at Cincinnati, Rocker spent five seasons as the defensive line coach at Troy State University in Troy, Alabama. While at TSU, three of his players received Division I-AA All-America honors, including Al Lucas, who earned the 1999 Buck Buchanan Award as the top defensive player in Division I-AA. A total of 13 TSU players garnered all-conference accolades under Rocker, while five players went on to sign NFL contracts, including Marcus Spriggs, who was drafted by the Cleveland Browns in the sixth round in 1999.
Rocker joined Houston Nutt's staff at Arkansas after one year at Cincinnati where he helped the Bearcats win a share of the 2002 Conference USA title. Rocker spent five years as the defensive line coach of the Razorbacks. His 2006 line ranked fourth in the SEC and thirty-third in the nation in rushing defense, holding opponents to 114.57 yards per game. Arkansas also ranked first in the SEC and twenty-first nationally in tackles for loss with 6.93. When Houston Nutt went to Ole Miss before the 2008 season, Rocker joined his Rebels staff.
In January 2014, Rocker was let go by the Titans and was hired to be the defensive line coach for the Georgia Bulldogs. On January 12, 2015, Rocker was promoted to Associate Head Coach. On February 7, 2017, Rocker was fired as the Georgia Bulldogs defensive line coach. Rocker was revealed to have committed a minor recruiting violation while at Georgia although the violation was unrelated to his firing.
In his first season with the Razorbacks, UA's 2003 defensive line helped the Hogs finish fifth in the SEC in total defense, allowing 344.0 yards per game. In 2004, Rocker coached first-team All-SEC end Jeb Huckeba, who produced 56 tackles, 13 tackles for loss and 6.5 sacks. Huckeba was as selected in the fifth round of the NFL Draft. Rocker's 2005 unit tied for second in the SEC with 29 sacks and was fourth in rushing defense behind Jackson, who earned second-team All-SEC honors after finishing fourth on the team with 74 tackles.
Under Rocker's guidance, Jamaal Anderson was the premier pass rusher in the SEC in 2006 with 14 sacks for 100 yards and 20.5 tackles for loss. The honorable mention All-American ranked third nationally in sacks per game with 1.0, while his 20.5 TFL ranked 12th. Anderson also notched 65 tackles and a team-best 26 quarterback hurries. Anderson was selected as the eighth pick of the first round of the 2007 NFL Draft, while fellow Razorback defensive lineman Keith Jackson was taken in the seventh round.
In 2010, Rocker coached 2010 Lombardi Award winner, AP All-American defensive lineman, and AP SEC defensive player of the yearNick Fairley, as well as AP second-team All-SEC defensive lineman Antoine Carter. Fairley led the SEC with 21 tackles for loss and was second in the SEC with 10.5 sacks.