Mariano Fazio currently serves as the auxiliary vicar of Opus Dei and lives in Rome. Born in 1960, he studied history at the University of Buenos Aires, and received a doctorate in philosophy from the Pontifical University of the Holy Cross, where he later became rector from 2002 to 2008. Subsequently he became the regional vicar of Opus Dei for Argentina, Paraguay and Bolivia until 2014.  Pope St. John Paul II ordained him as a priest in 1991.  Of his 20 books, four are available in English from Scepter: Pope Francis: Keys to his Thought,A History of Modern Philosophy,A History of Contemporary Philosophy, andLast of the Romantics: St. Josemaría in the Twenty-First Century.