After his ordination in 1975, he obtained a doctorate in theology and canon law. He was acting rector of the Pontifical Hungarian Institute in Rome and later rector of Pázmány Péter Catholic University. He was consecrated bishop by Pope John Paul II on 6 January 2000 in St. Peter’s Basilica in Rome. Since 1986 he has been Secretary of the Ecclesiastical Law Committee of the Hungarian Catholic Bishops’ Conference, and since 1999 he has been its President. His academic and literary activities have resulted in more than 200 studies and 20 volumes on canon law and medieval canon law history. In 2002 the Holy Father appointed him Archbishop of Esztergom and Budapest, Primate of Hungary.