At the 2003 World Cross Country Championships Chemjor finished fifth in the long race, while the Kenyan team, of which Chemjor was a part, won the silver medal in the team competition. She participated in the World Half Marathon Championships in 2001 and 2003. She also won the 2003 Berlin Half Marathon.
|2001||Marseille-Cassis Classique Internationale||Marseille, France||1st||Half Marathon||1:09:52|
|2007||Amsterdam Marathon||Amsterdam, Netherlands||1st||Marathon||2:28:16|
- IAAF website, April 6, 2003:Strong winds and snow cannot stop Kenyan romp in Berlin Half Marathon
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