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It is a pleasure to edit this issue of The Reasoner and I am grateful to Michael Friedman for agreeing to be interviewed for the purpose. Michael is Frederick P. Rehmus Family Professor of Humanities as well as the executive director of the Center for History and Philosophy of Science (CHPS) at Stanford University. He is primarily known for his contributions in at least two areas: the philosophy of science (and philosophy of physics in particular) as well as the history of philosophy of science. The latter includes work on logical empiricism and its intellectual roots in nineteenth-century philosophy of science (e.g., his books Reconsidering Logical Positivism (1999) and A Parting of the Ways: Carnap, Cassirer, and Heidegger (2000)). It also comprises his work on Kant and, in particular, on Kant’s interaction with the exact sciences of his time. Michael’s contributions to Kant scholarship include his books Kant and the Exact Sciences (1992), Dynamics of Reason (2001) and The Kantian Legacy in Nineteenth-Century Science (2006), as well as numerous articles that have shaped the subsequent debates in the field. His new book Kant’s Construction of Nature (Cambridge University Press) has just appeared in print and I thought of this as a good opportunity to ask him about his recent work related to Kant as well as about the evolution of his ideas over the years. Since this interview is for The Reasoner (and thus intended for an audience interested in reasoning in the sciences), the focus of our discussion is on one particular recurring topic in Michael’s research, namely Kant’s philosophy of geometry and, more specifically, the latter’s understanding of the role of diagrams in geometrical reasoning. Diagrammatic reasoning has recently turned into an active field of research that comprises and connects work in the history and philosophy of mathematics, in psychology, as well as in logic. In our interview, Michael talks about his specific interpretation of Kant’s understanding of geometrical proofs and also how his views relate to these recent and more general results concerning the mathematical reasoning with diagrams.