The Most Rev. Benjamin Paul Mwanzia Nzimbi was born in 1945 in Kitui County in a family of 8 children. He attended Ithookwe Primary, Mulutu Intermediary and Kitui School. He joined Kenyatta University for a Bachelor’s Degree in Education, Majoring in Religion. He went on to lecture at the Machakos Training College where he also served as the Dean of Students and Head of Social Studies. While at the College, he was trained and ordained as the chaplain. He is married to Alice Kavula and the couple has five children.

He left his career in teaching for full time ministry. He enrolled at the Trinity and St. Francis College in Karen, Nairobi where he studied Priesthood. In 1985 he was elected as the Bishop of the newly formed ACK Diocese of Machakos where he served for the next 10 years before being elected again to lead the newly created ACK Diocese of Kitui.

On the 16th of August 2002, he was elected and consecrated as the 4th Archbishop of the Anglican Church of Kenya and Bishop of All Saints Cathedral Diocese. He served up to 2009 when he retired.