 He was confirmed as the Provost of St. Philip and Andrew‘s Cathedral Mukono, in 2004.Kaziimba was consecrated as a bishop and was installed as 4th Bishop of Mityana Diocese, on 26 October 2008 replacing Bishop Dr. "Dunstan Kopriano Bukenya".He was elected to be the next Archbishop of Uganda by a secret ballot, with more than a two thirds majority of the bishops of the Church of Uganda on 28 August 2019.