Most of my research falls into three related areas: the philosophy of mathematics (logicism, structuralism, Dedekind, Cassirer, the philosophy of mathematical practice); the history and philosophy of logic (the rise of meta-logic, notions of completeness); and early analytic philosophy (Frege, Russell, Carnap, Wittgenstein, Strawson, etc.). But I also have broader interests, e.g., meta-philosophy (analysis and explication, philosophical history), Neo-Kantianism (the Marburg School), and general philosophy of science (Thomas Kuhn, theories of explanation, etc.), partly also the philosophy of technology and aesthetics.