I study dynamical systems, topology, the history of mathematics, and recreational mathematics. I am also very interested in writing for general audiences.

For more information, see:

• My publications
• My invited lectures
• More information about my book Tales of Impossibility: The 2000-Year Quest to Solve the Mathematical Problems of Antiquity
• More information about my book Euler’s Gem: The Polyhedron Formula and the Birth of Topology
• More information about Math Horizons, the undergraduate magazine of the Mathematical Association of America, for which I am currently editor