Logic and the philosophy of language; the semantics and logic of propositional attitudes, indexicals, demonstratives, and expressives.
- Alford Professor of Natural Religion, Moral Philosophy, and Civil Polity, Harvard University
Logic and philosophy of science, with concentration on foundations of physics, within an empiricist approach
Political philosophy; the ethics of war; bioethics; theories of justice
Philosophy of physics, especially the direction of time & the interpretation of quantum theory; pragmatism & metaphysics; philosophy of language.