After ordination to the diaconate in 1961 and the priesthood in 1961, he served as rector of the Church of the Good Shepherd in
Little Rock, Arkansas from 1961 to 1965. He served as rector of Calvary Church in
Columbia, Missouri from 1972 to 1976. He was called to the Diocese of Southwest Florida in 1976 to become Next, he was rector of St. Boniface in Sarasota, Florida in 1976, serving there until 1985. As bishop, he regularly preached about world peace, the arms race, and AIDS and was traditionally known to visit two parishes on Sundays. He was also a supporter of the ordination of women as priests and bishops but did not support ordaining gay and lesbian persons.
Barbara Harris became the first female suffragan bishop of the Episcopal Church under his tenure. He founded the DoveMass program which recruited volunteers to work in public schools. His episcopacy was characterized with a number of clashes with some congregations, notably in 1993 when he was involved in a public dispute with
Emmanuel Episcopal Church, Boston, over their music program. He was also in conflict with the
Church of the Advent after criticizing how the church was governed. In return the church filed suit asking for a court injunction to keep him from interfering. In November 1994, Johnson announced that he intended to retire on June 5, 1995. ==Death==