February 2015, Derrick wuxuu ku guuleystay markii saddexaad ee isku xigta ee US Senior Men 12,000 mitir USA Cross Country Championships 36:18, Boulder, Colorado, si uu ugu qalmo 2015 IAAF World Cross Country Championships
wuxuu ku guuleystay tartankii 24aad ee lagu qabtay magaalada Guiyang ee dalka Shiinaha.