Klaus Demmer, MSC (1931-2014) was a Catholic priest and theologian. Born in Münster, Germany, he was a professor who taught moral theology at the Gregorian University in Rome from 1970 to 2003, and was the first non-Jesuit to do so. He was also a co-founder of the International Academy for Marital Spirituality (INTAMS). He was far better known to European theologians than to Americans or the English-speaking world, but two of his books were translated into English: Shaping the Moral Life: An Approach to Moral Theology (trans. Roberto Dell'Oro, ed. James Keenan, Washington, D.C., 2000), a translation of the manuscript Einführung in die Moraltheologie; and Living the Truth: A Theory of Action (trans. Brian McNeil, Washington D.C., 2010).
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