Dr. Donald MacKenzie is professor of Sociology in the School of Social and Political Science at the University of Edinburgh. His work constitutes a crucial contribution to the field of Science and Technology Studies. MacKenzie’s current research is on the sociology of markets, focusing on automated trading, the use of mathematical models, and the evaluation and trading of bonds. MacKenzie has worked in the past on topics ranging from the sociology of nuclear weapons to the meaning of proof in the context of computer systems critical to safety or security.