[1] Ngolepus entered the 2001 Berlin Marathon as a pacemaker for fellow Kenyans Willy Cheruiyot Kipkirui and William Kiplagat.

[1][3] In 2003, Ngolepus won the CPC Loop Den Haag half marathon in a time of 1:00:56.

[4] Later in the year, he came third at the London Marathon, losing in a sprint by one second to Ethiopian Gezahegne Abera and Italy's Stefano Baldini.

[2] In 2005, Ngolepus came second at the Berlin Half Marathon behind fellow Kenyan Paul Kimugul.

[10] In 2008, Ngolepus fled Kenya during the 2007–2008 Kenyan crisis, in order to compete at the Los Angeles Marathon.