Elizabeth Harman is Laurance S. Rockefeller Professor of Philosophy and Human Values at Princeton University. She is the author of "Morally Permissible Moral Mistakes" (Ethics), "The Irrelevance of Moral Uncertainty" (Oxford Studies in Metaethics), "Creation Ethics: The Moral Status of Early Fetuses and the Ethics of Abortion" (Philosophy and Public Affairs), and other essays in moral philosophy.