He played college football for the North Carolina Tar Heels and was signed by the Pittsburgh Steelers as an undrafted free agent in after the 2005 NFL draft.

[1][2] Warren attended the University of North Carolina, where he started his college football career as a walk-on long snapper in 2000.

During his rookie season in 2005, Warren was used entirely as a long snapper, beating former Steelers center Mike Schneck for the job.

This tied the score and gave the Giants good field position on the ensuing kick resulting in the go ahead touchdown late in the game.

[6] On December 21, 2009, Warren was placed on injured reserve with a torn anterior cruciate ligament (ACL), officially ending his 2009 season in week 14.