Buuxi weedha soo socota: Bishii Febraayo 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 ee Guiyang, Shiinaha, halkaas oo uu kaalinta 24-aad galay.