Pedzisa mutsara unotevera: Chepkok akaberekerwa muKapkitony mudunhu reKeiyo muKenya's Rift Valley Province. Akakunda menduru yesirivha munhangemutange yevaduku pa
2007 World Cross Country Championships, akapedza wechipfumbamwe pa 2009 World Championships uye wechinomwe pa 2009 World Athletics Final. Akawana kukunda kukuru kwemamita zviuru zvishanu pa2010 IAAF Diamond League circuit, achikunda kuBritish Grand Prix.