Clark was born and raised in Lawrenceville, Georgia, in 1990. In January 2008, he committed to the United States Air Force Academy after receiving a football scholarship.[1][2] He had been a quarterback in high school and was converted to a tailback at Air Force.[3][4] He gained 588 rushing yards as a freshman in 2008,[5] 865 yards as a sophomore in 2009,[5] and 1,031 yards as a junior in 2010.[6][7][8] During the 2011 season, Clark totaled 1,110 rushing yards on 163 carries for an average of 6.8 yards per carry.[5][9]
By the end of the 2011 season, Clark ranked as the second leading rusher in Air Force Academy history.[10][11] He was removed from the Air Force Academy in May 2012, for illegal drug use, less than one week before he was due to graduate.[12][13][14][15][16]
^"Clark tops list of Lions' commitments". The Atlanta Journal-Constitution. January 24, 2008.
^"Lions' Clark commits to Air Force Academy". Gwinnett Daily Post. January 25, 2008.
^"Freshman Clark Right at Home in New Position". The Gazette. October 26, 2008.
^"Instant impact Freshman tailback Clark could get the start against UNLV". The Denver Post. November 17, 2008.