 Two years later, on November 7, 1988, he was appointed Auxiliary Bishop of the Roman Catholic Archdiocese of Washington by Pope John Paul II.Consecrated bishop on December 20, 1988, he served as Regional Bishop of Northeast, Southeast and East Northwest Deaneries of the District of Columbia, and Deaneries of North and Middle Prince George's Counties and, since 1995, the Deaneries of Northeast and Southeast of the District of Columbia, of Lower Prince George County, and Counties of Charles, Calvert, and St. Mary's.Olivier was a Fourth Degree Knight of St. Peter Claver, a Fourth Degree Knight of St. John and Columbus.