Jemison, who signed with the Steelers on Feb. 17, played at both Indiana University of Pennsylvania and the University of Pittsburgh during his college career. He originally signed with the New York Giants as an undrafted rookie free agent in 2005, but was released from the team's practice squad on Sept. 13.
Jemison spent the spring of 2006 playing for the NFL Europe League's Hamburg Sea Devils, where he led the team with 368 yards rushing on 101 carries (3.6 avg.) and caught 18 passes for 148 yards (8.2 avg.). He rushed for 1,767 yards and 14 touchdowns on 323 carries (5.5 avg.) during his college career at IUP.