Hans Küng

Hans Küng was a Swiss Catholic priest, theologian, and author. He was a leading and often controversial figure in modern Catholic thought, known for his critique of papal infallibility and his advocacy of a re-examination of Catholic doctrine. He served as a theological adviser (peritus) at the Second Vatican Council (1962–1965) and was Professor of Ecumenical Theology at the University of Tübingen from 1960 until his retirement in 1996.