John J. McMahon (bishop)
John Joseph McMahon (September 27, 1875 – December 31, 1932) was an American prelate of the Roman Catholic Church. He served as Bishop of Trenton from 1928 until his death in 1932. Biography. John McMahon was born in Hinsdale, Cattaraugus County, New York and graduated from Union High School in 1893. He attended St. Bonaventure University in Allegany, New York, earning a Bachelor of Arts and completed his theological studies at the Pontifical Urbaniana University. He was ordained to the priesthood on May 20, 1900. Upon returning to New York, he served as a curate in Jamestown  and Buffalo before becoming pastor of Newfane. He also served as assistant superintendent of diocesan schools and director of the Holy Name Society. On March 2, 1928, McMahon was appointed the fourth Bishop of Trenton, New Jersey, by Pope Pius XI. He received his episcopal consecration on the following April 26 from Bishop William Turner, with Bishops Thomas Walsh and Edmund Gibbons serving as co-consecrators, at St. Joseph's Cathedral. He was installed at St. Mary's Cathedral, Trenton, New Jersey on May 10, 1928. After four years as bishop, McMahon died at age 57 on December 31, 1932