Arthur Allen Leff (1935–1981) was a professor of law at Yale Law School who is best known for a series of articles examining whether there is such a thing as a normative law or morality. Leff answers this question in the negative and follows the consequences to their logical conclusions. He graduated from Amherst College and Harvard Law School and would also teach at the Washington University School of Law. Leff states as follows in the closing of Unspeakable Ethics, Unnatural Law: