Arthur Mathis Cooper was ordained to the Gospel Ministry in 2003 by the United Christian Fellowship Church in Minneapolis, MN. Currently, he serves as a member of the pastoral team of AUMF. Previously, he served as assistant pastor at United Christian Fellowship church for three years. He is the founder of the United Christian Assembly, Inc, Paynesville, Liberia. He has worked with the Tubman Memorial United Methodist Church in Liberia and the Buduburam United Methodist Church in Ghana as Lay Speaker and Youth & Young Adult Coordinator.

Mathis attended the Gbarnga School of Theology (now United Methodist University) in Liberia, and the Acts International Bible College in Minneasota where he graduated 2004 with a Bachelor of Divinity Degree.

Mathis is married to Sarah, and the the union is blessed with four children