Kigen's breakthrough year came in 2006 when he represented Kenya internationally at three competitions.

He represented Kenya at the 2006 Commonwealth Games at the age of 16.

Jason is also a swimmer and represents Kenya.

He represented Kenya at the 2004 Athens Olympics and reached the final but failed to finish the race.

Until 2002 he was known as Stephen Cherono, and represented Kenya.

The younger brother, David, is also a swimmer and represents Kenya.

He has represented Kenya on the track and on grass.

He expressed a desire to compete in 2008 Olympics, but was not selected to represent Kenya.

She represented Kenya in the 5000 m at the 2008 Beijing Olympics.

She represented Kenya at the 2008 Summer Olympics, coming eleventh in the 5000 m final.