He has taught history of European thought, including contemporary issues considered from a global perspective. He wrote books and articles on French and German thinkers, especially Jacques Derrida, Sigmund Freud, and Hannah Arendt. He also translated books by Derrida, Drucilla Cornell, and Yosef Hayim Yerushalmi (from French or English into Japanese). His current research focuses on the relationship between philosophy and American society, and he conducts historical, philosophical and literary investigation into political and religious problematics from medieval south-east France to today’s New York.