[2] He was appointed the bishop of Ngong Diocese on by Pope Benedict XVI on 7 January 2012.
[3][4] The Diocese of Ngong remained vacant with the resignation of Bishop Cornelius Schilder, M.H.M.
John Oballa Owaa obtained a licentiate and PhD Degrees in Canon Law at the Pontifical Urban University, Rome.
While in Rome, he also worked as an official of the Pontifical Council for Health Pastoral Care between the years 1995 and 1997.
At the time of the appointment of Msgr Oballa, the Diocese of Ngong had an approximated population of 1,011,000 people, with 83,247 Catholics.