Fr. Mulcahy entered the Order of Preachers in 1993 and was ordained a priest in 2003. He has taught theology to undergraduates at Benedictine College in Atchison, KS, at Providence College in Providence, RI, and at the Australian Catholic University in Melbourne, Australia. Before his ordination, Fr. Mulcahy served as Court Guardian for Children at the Metropolitan Tribunal in Boston, MA, and as Assistant Director of the Catholic Information Service of the Supreme Council of the Knights of Columbus, in New Haven, CT.