Donald MacKenzie is Professor of Sociology (Personal Chair) at the University of Edinburgh. He was winner of the 2005 John Desmond Bernal Prize, awarded jointly by the Society for Social Studies of Science and the Institute for Scientific Information, for career contributions to the field of science studies. His books include Inventing Accuracy (MIT Press, 1990), Knowing Machines (MIT Press, 1996), Mechanizing Proof (MIT Press, 2001), and An Engine, Not a Camera: How Financial Models Shape Markets (MIT Press, 2006).