Apr 9, 2021 | liturgy | Hans Küng (19 March 1928 – 6 April 2021) was a highly influential Roman Catholic priest and Swiss theologian. After questioning papal infallibility in his book Infallible? An Inquiry (1971), he was no longer allowed to teach as a Catholic theologian, he was allowed to continue to function as a priest, and he remained at the University of Tübingen as a professor of ecumenical theology. Küng was ordained a priest in 1954 after having studied philosophy and theology in Latin for seven years at Rome’s Gregorian University. He then studied in French for three years at the Sorbonne and the Institut Catholique in Paris, completing a doctorate, “Justification. La doctrine de Karl Barth et une réflexion catholique” ( Justification: The Doctrine of Karl Barth).