He received his Ph.D. from the University of Pittsburgh in 1969. His areas of interest are in the philosophy of language and metaphysics, language and mind, linguistic theory, philosophical logic and epistemology. He is presently doing research on mind and language, pragmatics and logic, theories of meaning and truth, and on indexicals and anaphora. Recent publications include "The Intentional Fallacy: Defending Beardsley" (coauthored with George Dickie, Journal of Aesthetics and Art Criticism, 1995), and "Some Reflections on the Prosentential Theory of Truth" (in Truth or Consequences: Essays in Honor of Nuel Belnap, D. Reidel, 1990).