His interests include the philosophy of language, the philosophy of mind, and epistemology. He is currently at the early stages of writing a book on the nature of the intellect and its principled, philosophical, limits. His most recent papers concern the cognitive value of the concept of truth, the role of the first-person perspective in disagreement, an account of the nature and significance of conceptual disagreements, and the question of whether attributing mental attitudes is a kind of measurement.