I have been on the faculty of the Economics Department since 1970 and have held a university-wide professorship since 1994. I have been Chair of the Economics Department and Provost of the University. My field is microeconomic theory. My current research is on modelling non-quantitative reasoning, rational and irrational. I teach Economics 1080, Great Theorems in Microeconomic Theory, which is in equal parts concerned with the intellectual history of modern economics and the applied mathematics in economic theory. This class meets in the Lowell House Large Seminar Room, TTh 1:30. I also teach Economics 2010b, a first-year graduate course that I pioneered, which is now used in virtually every Ph.D. program in the world. Undergraduates frequently take it as well. I am a Senior Fellow in the Harvard Society of Fellows and a Syndic of the Harvard University Press and former chair of the Faculty Committee on Athletic Sports.