Gerald O'Collins earned his PhD at the University of Cambridge and, from 1973 to 2006, taught at the Gregorian University (Rome), where he was also Dean of Theology (1985-91). He has been a visiting professor or guest lecturer at many universities and colleges around the world. He is now adjunct professor of Australian Catholic University and research fellow of the University of Divinity (Melbourne). He has authored or co-authored hundreds of articles and sixty-three published books, many of which have also appeared in other languages. His work deals mainly with questions in Christology, fundamental theology, and the teaching of the Second Vatican Council (1962-65).