His primary interests include the relationship between philosophy, mathematics and science in the work of Immanuel Kant, as well as mathematical cognition more generally. He has been awarded grants by the National Science Foundation and the American Philosophical Society. His articles and chapters have appeared in journals including the Philosophical Review, the Canadian Journal of Philosophy, the Journal of the History of Philosophy, the Royal Institute of Philosophy Supplement, and the anthology Discourse on a New Method: Reinvigorating the Marriage of History and Philosophy of Science (Open Court, 2010).