Thomas Dunne studied at Saint Joseph’s Seminary, Yonkers, New York, and was ordained a Catholic Priest on June 2, 1912. Before the war he was assistant pastor of Saint Joseph’s church in Manhattan, and Saint Patrick’s Church in Richmond. He was commissioned a U.S. Army chaplain on September 17, 1917, serving in World War I and earning the Distinguished Service Cross and Purple Heart. After the war he was assistant pastor of Saint Mary’s Church in Ellenville, New York, and then Holy Innocents church in Manhattan. He next became pastor of Saint Stanislaus Roman Catholic Church in Pleasantville, New York, for 23 years until his death. He also served as Chaplain of The Archdiocese of New York.