[2] As a player, Okumu played for various clubs as well as the Kenyan men's national volleyball team[3] from 1990 to 2003.
Godfrey Okumu is a holder of a FIVB Level 3 coaching certificate and is a member of the Japanese Society of Volleyball Research.
[3] Okumu served as part of the coaching staff of the Oita Miyoshi Weisse Adler men's professional volleyball club from 2009 to 2012.
[7] Okumu served as head Coach of the UP Lady Fighting Maroons, the women's volleyball collegiate team of the University of the Philippines.
[7] Okumu has said that he will introduce the "Japanese style" of play to the collegiate team which he learned in his Japan stint.