Past bishops of the diocese

Bishop Philip Joseph Garrigan - Ordained bishop June 18, 1902, at Cathedral of the Epiphany. Died Oct. 14, 1919.

Bishop Edmond Heelan - Ordained auxiliary bishop April 8, 1919, at Epiphany. Installed as Bishop March 8, 1920. Died Sept. 20, 1948.

Bishop Thomas Lawrence Noa - Ordained auxiliary bishop March 19, 1946, at St. Andrew Cathedral, Grand Rapids, Michigan. Appointed Bishop of Marquette Aug. 20, 1947. Died March 13, 1977

Bishop Joseph Maximillian Mueller - Ordained coadjutor with right of succession Oct. 16, 1947, at St. Peter Cathedral, Belleville, Illinois. Became bishop automatically at Bishop Heelan’s death Sept. 20, 1948. Retired Oct. 20, 1970. Died Aug. 9, 1981.

Bishop Frank Henry Greteman - Ordained auxiliary bishop May 26, 1965, at the Cathedral of the Epiphany. Installed Dec. 9, 1970. Retired Jan. 25, 1983. Died in 1987.

Bishop Lawrence Donald Soens - Ordained bishop Aug. 17, 1983, at the Cathedral of the Epiphany. Retired Nov. 28, 1998. Died Nov. 1, 2021.

Bishop Daniel DiNardo - Ordained bishop Oct. 7, 1997. Installed as Archbishop of Galveston-Houston March 26, 2004. He was elevated to the College of Cardinals in 2007. 

Bishop Ralph Walker Nickless - Ordained bishop Jan. 20, 2006. Retired Feb. 12, 2025, becoming apostolic administrator. He was originally a priest of the Archdiocese of Denver.