Bishop Walker is a graduate of Clinton Junior College, where he received an A. A. degree. He earned an A.B. degree from Benedict College in 1970, and the Master of Divinity degree from Hood Theological Seminary in 1971.
His pastorates include Rock Hill and Piney Grove, Pageland, South Carolina; St. James and Mt. Airy, Chesterfield, South Carolina; Foundation and Tabernacle, Rock Hill, South Carolina; Jones Memorial, Columbia, South Carolina; and Greater Walters, Chicago, Illinois.
Bishop Walker was elected bishop on August 5, 1988 at the 43rd General Conference as the 81st bishop of the A.M.E. Zion Church. Bishop Walker was also elevated to the Senior Bishop post of the A. M. E. Zion Church in 2004.
He has served in leadership positions on several boards of the A. M. E. Zion Church and with ecumenical organizations, representing the Church and mankind. Some include: Publishing House Board; Harriet Tubman Foundation; Restructuring Committee; Balm in Gilead; conference and connectional level positions.
As Presiding Bishop of the North Eastern Region Episcopal District, he led the conferences in the purchase of a stately Episcopal residence, located in Farmington, Connecticut. The residence was dedicated on October 11, 1997. As Presiding Bishop of the Piedmont Episcopal District since 2004, he has led these conferences in the purchase of an Episcopal residence in Waxhaw, NC, which is in the suburbs of Charlotte, NC. This residence was dedicated in the fall of 2006.