FREEMAN DYSON, emeritus professor of physics at the Institute for Advanced Study in Princeton, has worked on nuclear reactors, solid-state physics, ferromagnetism, astrophysics, and biology, looking for problems where elegant mathematics could be usefully applied. His books include Disturbing the Universe, Weapons and Hope, Infinite in All Directions, and Maker of Patterns. The Conversation: https://www.edge.org/conversation/freeman_dyson-the-brain-is-full-of-maps