He opposes the dominant scientific philosophy of scientific naturalism, instead defending a philosophy of the humanities worked out by his mentor, the late E. M. Adams. He is particularly interested in the nature of presuppositions, the theory of the categories, the a priori, philosophical knowledge, and philosophical argumentation, in the course of articulating and defending a humanistic worldview. He considers college teaching as his vocation and is committed to advancing liberal education. An excellent photographer, he enjoys cello and gardening and is committed to environmental causes.