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Karl Rahner was a German Jesuit who made a profound contribution to Catholic theology in the twentieth century.  His role as a theological expert at the Second Vatican Council, his 1651 publications (4744 counting reprints and translations), his involvement in international theological debate, his impact on students who attended his classes, and his positive reception by many Protestant thinkers, all contributed to his influence on theology today.
The Karl Rahner Society was founded in 1991 by American scholars to promote Rahner studies, as well as the publication of his works in English, reflection on his thought and spirit, and collaboration among scholars concerned with his work.