Ku dhammaystir weedha soo socota:
2003 IAAF World Half Marathon Championships oo ka dhacday Vilamoura, Spain, laakiin kama aysan dhameysan meel ka fiican 41aad. Kosgei wuxuu u tartamay Kenya ciyaarihii Olombikada ee xagaaga 2008 ee marathon, isagoo dhammeystiray kaalinta tobnaad.