Reginaldus Thomas Foster (1939-2020) was an American Catholic priest and friar of the Order of Discalced Carmelites. He worked in the ""Latin Letters"" section of the Secretariat of State in the Vatican and was the Papal Latinist from 1969-2009. Daniel Patricius McCarthy, a student of Foster's, is a monk at St. Benedict's Abbey in Atchison, Kansas, and teaches Latin in London and Rome.