2015: Walk-on reserve running back ... has played in six career games.
2014: Played in six games ... saw action against Kansas, Tulane, Georgia Tech, Syracuse, Virginia Tech and North Carolina ... on the field for 18 total snaps.
2013: Did not see game action.
2012: Did not see game action.
PRIOR TO DUKE: Two-year letterman at Severn under coach Chris Kirchenheiter ... as a senior, rushed for 1,069 yards and 15 TDs while recording 87 tackles and six sacks ... had 89 tackles during junior season ... also participated in baseball, basketball, golf and track and field.
PERSONAL: Son of Colin Callahan and Sherry Vain-Callahan ... father graduated from Duke in 1988 ... sister, Alyssa, graduated from Duke in 2011 ... born September 28, 1993 ... majoring in economics.