These thirteen original essays, whose authors include some of the world's leading philosophers, examine themes from the work of the Cambridge philosopher G. E. Moore (1873-1958), and demonstrate his considerable continuing influence on philosophical debate. Part I bears on epistemological topics, such as skepticism about the external world, the significance of common sense, and theories of perception. Part II is devoted to themes in ethics, such as Moore's open question argument, his non-naturalism, utilitarianism, and his notion of organic unities.