Born in Rubanda, Uganda, Fr. Tumusiime was ordained to the priesthood on August 15, 1993.
Fr. Tumusiime comes from a family of nine siblings with  both parents who celebrated their golden jubilee of their marriage as he celebrated his twentieth anniversary to priesthood two years ago in 2014.

Since his ordination, he has served as a parish priest in Ethiopia; a “father in-charge” of peace and justice/gender issues for the Apostolic Vicariate of Awasa in Ethiopia; the regional secretary for the Apostles of Jesus (AJ) Uganda Region; and parochial vicar and administrator at Catholic churches in Oregon. With the support of his local community, Fr. Tumusiime also helped found the Rubanda Solidarity Development Association and the Rubanda Solidarity Nursery/Primary School.
 
In 1993, Fr. Tumusiime earned a bachelor’s degree in sacred theology from the Pontificia Università Urbaniana in Rome, Italy. In 2007, he earned a master’s degree in human development and food security from the Università Degli Studi, also in Rome.
 
The Apostles of Jesus missionaries serve around the world in the ministries of primary evangelization, pastoral care of the sick, and chaplaincy to college and university students. The missionary society also ministers to impoverished, abandoned, and homeless children.

In recent months, Fr. Tumusiime has been assisting at St. Faustina Church of St. Anthony Parish in Jackman and Holy Family Parish in Greenville.