Later from 1997 till 1998, he did his philosophical studies at St. Augustine Major Seminary in Mabanga, Bungoma, Kenya.
He also holds a Master's Degree in Pastoral Theology awarded by the Catholic University of Eastern Africa, in Nairobi.
Over the years, he has served in various roles in the Catholic Church, including as:[2] On 13 February 2024 Pope Francis appointed Father Wallace Ng'ang'a Gachihi, as an Auxiliary Bishop of the Catholic Archdiocese of Nairobi.
[1] On 15 August 2024, Pope Francis appointed him as the Bishop of the Military Ordinariate of Kenya.
[1][3] He was installed as the third Ordinary of Kenya Military on 12 October 2024, replacing Bishop Alfred Kipkoech Arap Rotich who, served in that role from 1997 until his retirement in 2016.