[6] In 2013, Chepkwony won the Seoul International Marathon in 2:06:59, taking home $80,000 for winning the race under 2:10:00.
[1] In November he won the Boulogne-Billancourt Half Marathon in France, setting a course record of 1:00:11.
[8] He opened the following season at the Santa Pola Half Marathon, coming second.
[9] In April, Chepkwony finished third in the 2014 Boston Marathon, his first top finish in the World Marathon Majors, behind American Meb Keflezighi and Kenyan Wilson Chebet.
[10] Chepkwony was a training partner of Dennis Kimetto[11] and Geoffrey Mutai.