My research is focused on the history of analytic philosophy - primarily W.V. Quine, Rudolf Carnap, and Gottlob Frege - and an array of issues in epistemology and metaphysics (both broadly construed) that arise from my historical work, including philosophical naturalism, ontology and meta-ontology, truth by convention, theories of truth, sense and nonsense, the analytic-synthetic distinction, empiricism, the epistemology of logic and mathematics, and external world skepticism.