Cormac Brian O'Duffy is an American-born Irishman who grew up in Ireland and the UK. He completed his university education in Ireland, where he received a bachelor of music from University College Dublin and a PhD from the University of Limerick. His oratorio Metzger was premiered on April 21, 2024 in Brandenburg-Görden Prison, Germany, where Blessed Max Josef Metzger (1887-1944)-the founder of the Una Sancta Brotherhood-was executed on April 17, 1944.