Leon Kass

Leon Kass (born February 12 1939) is an American bioethicist, best known as a leader in the effort to stop human embryonic stem cell and cloning research as former chair of the President's Council on Bioethics from 2002–2005.

He obtained S.B. and M.D. degrees (1958; 1962) at the University of Chicago and obtained a Ph.D. in biochemistry (1967) at Harvard University. He then taught at St. John's College from 1972 to 1976. He currently retains a position as a member of the President's Council and is the Addie Clark Harding Professor in the College and the Committee on Social Thought at the University of Chicago, and is the author of several books, including 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; and The Beginning of Wisdom: Reading Genesis.

Bioethics views
Kass places "special value on the natural human cycle of birth, procreation and death", and views death as a "necessary and desirable end". As such, he has opposed most kinds of interference in the reproductive process—including birth control—as well as all deliberate efforts to increase human longevity.

Kass makes a slippery slope argument with regards to the use of reproductive technology such as in vitro fertilization, even though at least one of his grandchildren was conceived through that technique. He feels that these now well-accepted practices desensitize society, increasing the likelihood of acceptance of more advanced technologies such as reproductive cloning. Kass suggests that possible medical therapies and disease treatments should be restricted if the technology used in them could also be used in reproductive cloning.

Kass also vigorously opposes progress in the fields of therapeutic cloning and embryonic stem cell research.

As stated, Kass finds wisdom in the Book of Genesis. For example, he has more than once given a lecture on the Tower of Babel story, in which he argues that the "sky-scraping tower" has to fall because it implies a secular form of society. Kass makes the claim that reason or science cannot provide "moral and political standards sufficient for governing civic life and of guiding the proper use of power and technique." See the related Argument from morality. Kass interprets the story as a metaphor, however. All of this informs his views on bioethics, according to the quoted version of the lecture. Elsewhere Kass expresses a strong faith that the potential of biological science is limited and will never provide answers to certain questions.

Views on women and sexual morality
Kass begins his essay "The End of Courtship" by asserting that the left and right in America have started to produce a consensus on some issues of sexual morality, coming to view "the break-up of marriage as a leading cause of the neglect, indeed, of the psychic and moral maiming, of America's children." The rest of the essay concerns what he sees as obstacles to lasting marriage, including feminism. Kass treats modesty in women as a very important element of sexual morality. "The supreme virtue of the virtuous woman was modesty, a form of sexual self-control, manifested not only in chastity but in decorous dress and manner, speech and deed, and in reticence in the display of her well-banked affections." Kass argues that when women behave with modesty, they are better able to achieve their own "genuine longings and best interests," and that female modesty also helps men to control lustful desires in favor of love and "real intimacy."

In the same essay Kass attacks the use of birth control technology, and states that any woman's destiny is motherhood. The author expresses strong doubt that "courtship" can ever return, since this "would appear to require a revolution". He says that the social changes stem from the nature of modernity, and from the biological nature of men. But he bemoans the changes because he sees marriage and procreation as central to the good life for the vast majority -- perhaps for all of humanity. The essay contains one explicit reference to homosexuality, as one of the "sexual abominations of Leviticus—incest, homosexuality, and bestiality". A footnote also mentions aging bachelors and their "self-indulgent" ways.

Philosophical influences

 * Leo Strauss


 * Hans Jonas