British moral philosopher Philippa Foot, Senior Research Fellow at Somerville College, University of Oxford, lectured on "Can There Be a Moral Ought?"  A lifelong inquirer into the nature and origin of moral thought and the author of several books on the subject, Dr. Foot introduced "The Trolley Problem," an enduring puzzle for ethicists, in 1967.  Her Virtues and Vices and Other Essays in Moral Philosophy appeared from Oxford: Blackwell and Berkeley: University of California Press in 1978.