Career
After that performance, he was not able to improve his PB, having problems in his training in 1996 and 1997. In 1998 he ran only 8"48", and decided to stop running. But at the beginning of October 1998, he met in Iten the Italian coach Renato Canova, in Kenya for the first time together with his manager Gianni Demadonna.
After a long talk, he decided to try again, following the new plan from the Italian Coach.
He is the elder brother of the current WR holder Stephen Cherono (Saif Saaeed Shaheen), who followed the same coach. Koskei has another brother, Abraham, who likewise follows the family tradition of steeplechasing.
Personal bests 3000 metres steeplechase - 8:05.43 (1999).