Tuhia he haere tonu mo tenei pene - I whanau a Chepkok i Kapkitony i te rohe o Keiyo o te Rohe Rift Valley o Kenya. I riro i a ia te mētara hiriwa i te whakataetae rangatahi i te 2007 World Cross Country Championships
, i mutu i te tuaiwa i te 2009 World Championships me te tuawhitu i te 2009 World Athletics Final. I wikitoria ia i te 5000 m nui i te 2010 IAAF Diamond League circuit, i wikitoria i te British Grand Prix.