Bishop-designate Herbert Bevard, 62, was serving as a pastor in Philadelphia and as a vicar for the archdiocese.
He was born in Baltimore, Maryland, in 1946. He converted to Catholicism from the Presbyterian community in 1964 and was ordained a priest in 1972 for the Archdiocese of Philadelphia.
St. Thomas has some 30,000 Catholics, served by 15 priests and 27 permanent deacons. It is a suffragan see of the Archdiocese of Washington, D.C. The see had been vacant since Bishop George Murry was named Bishop of Youngstown, Ohio, in January 2007.
Bishop Francis Malooly, 64, served as the auxiliary bishop of Baltimore since 2001. In Wilmington, he succeeds Bishop Michael Saltarelli, 75, who retired.
Francis Malooly was also born in Baltimore, in 1944. He was ordained a priest of that archdiocese by his uncle, the late Bishop Austin Murphy, in 1970.
Wilmington has some 230,000 Catholics, served by 214 priests, 94 permanent deacons and 380 religious.