On May 5, 2011, Archbishop Allen H. Vigneron ordained the Most Rev. Michael J. Byrnes auxiliary bishop of the Archdiocese of Detroit. Since 2004, Bishop Byrnes had served as vice rector of Sacred Heart Major Seminary, where he earned his Master of Divinity. Bishop Byrnes was ordained a priest by Cardinal Adam Maida in 1996. He later studied in Rome at the Pontifical Gregorian University where he earned a doctorate of sacred theology in 2003.