 Jefferson verbally committed to Maryland on January 24, 2011 and signed on February 2.Jefferson played all four years with the Terrapins, playing in 37 games over that span.Jefferson was drafted in the fifth round of the 2016 NFL Draft with the 147th overall selection by the Seattle Seahawks after the team swapped seventh round pickss with the New England Patriots while giving them a fourth round pick in the 2017 NFL Draft in order to move up to #147 in order to select Jefferson.