Father Hans Küng is pictured in his office in Tübingen, Germany, in this February 2008 file photo. Father Küng, a prominent and sometimes controversial theologian who taught in Germany, died April 6, 2021, at age 93. (CNS photo/Harald Oppitz, KNA) Hans Küng was only 34 years of age when a visit to the United States firmly established him as the leading theologian of the time. In February 1963, between the first and second sessions of the Second Vatican Council, he began an eight-week tour by addressing an audience of 3,000 in the gymnasium of Boston College. He went on to lecture at Harvard, Yale, the University of Chicago (audience of 5,000), Gonzaga University, the University of California in Los Angeles and elsewhere. An audience of 8,500 heard him speak at the University of St Louis, where he received the first honorary doctorate of his career.