Heimir Geirsson is Assistant Professor of Philosophy at Iowa State University. He is the co-editor, with Michael Losonsky, of Readings in Language and Mind (Blackwell Publishers, 1996) and has published on philosophy of language and mind, metaphysics, and epistemology in Australasian Journal of Philosophy, Erkenntnis, and Journal of Philosophical Research. Michael Losonsky is Associate Professor of Philosophy at Colorado State University. He is the co-editor, with Heimir Geirsson, of Readings in Language and Mind (Blackwell Publishers, 1996). He has published on contemporary metaphysics in American Philosophical Quarterly, Minds and Machines, Philosophical Review, Philosophical Studies, and Philosophy, amongst others. He has also published on metaphysics in the history of modern philosophy in British Journal for the History of Philosophy, Journal of the History of Philosophy, and Pragmatics and Cognition, among others.