Following an 11-year playing career with the New York Giants (1999–2002), Dallas Cowboys (2003–05), Detroit Lions (2006–08), and New Orleans Saints, Campbell entered the NFL coaching ranks (2009). He was the defensive line coach for the Dallas Cowboys from 2009 to 2011 and the defensive coordinator for the Jacksonville Jaguars in 2012. In 2013, he became the linebackers coach for the Detroit Lions. Campbell played college football at Miami (OH). He started eight games at right guard for the Giants in 1999 and also saw action at right tackle. That same year, he participated in his first Pro Bowl after being selected as a starter at right guard by the coaches. He spent five seasons with the Giants, helping them reach the Super Bowl after the 2002 season. During that time, he started 43 of 44 games played at right guard. The only exception was a game at left guard when John Hall was injured. After getting released by the Cowboys in 2008, Campbell joined the Lions' staff as a free agent. He replaced Jim Colletto who was fired by the team. Under Campbell's guidance, the Lions' defense improved in every category except for total yards allowed. They were ranked second in run defense in 2009 before falling to tenth in 2010 and eleventh in 2011. In 2012, their defense finished first in the league allowing only 99.4 rushing yards per game.