Leon Kass

Leon Richard Kass (born February 12, 1939) is an American physician, scientist, educator, and public intellectual, best known as proponent of liberal education via the "Great Books," as an opponent of human cloning, life extension and euthanasia, as a critic of certain areas of technological progress and embryo research, and for his controversial tenure as chairman of the President's Council on Bioethics from 2001 to 2005. Although Kass is often referred to as a bioethicist, he eschews the term and refers to himself as "an old-fashioned humanist. A humanist is concerned broadly with all aspects of human life, not just the ethical."

Kass is currently the Addie Clark Harding Professor Emeritus in the College and the Committee on Social Thought at the University of Chicago and the Hertog Fellow at the American Enterprise Institute. His books include Toward A More Natural Science: Biology and Human Affairs; The Hungry Soul: Eating and the Perfecting of our Nature; Life, Liberty, and the Defense of Dignity: The Challenge for Bioethics; The Beginning of Wisdom: Reading Genesis; and What So Proudly We Hail: The American Soul in Story, Speech, and Song.

Kass was born in Chicago to Jewish immigrants from Eastern Europe. He described his family as "Yiddish speaking, secular, socialist." Although his upbringing was not religious, it was moralist: "Morality, not Judaism, was the religion of our home, morality colored progressively pink with socialism, less on grounds of Marxist theory, more out of zeal for social justice and human dignity." He would not begin to explore his religious heritage until later in his career

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