Middle-distance runner who won gold in the 800 meter race at the 2012 Summer Olympics; also won gold in the 800 meter event at the 2011 World Championships.
He attended St. Patrick's High School in Iten, Kenya.
He won gold in the 800 meter race at the 2006 World Junior Championships.
His parents Daniel and Naomi were both competitive track and field athletes.
He broke Sebastian Coe's 800-meter record in 2010.