Hal R. Varian is Dean of the School of Information Management and Systems at the University of California, Berkeley. He also holds joint appointments in Berkeley's economics department and Haas School of Business. Professor Varian earned his S.B. from MIT, and his Ph.D. from Berkeley. He has taught at the University of Michigan, MIT, Stanford University, University of Siena (Italy), University of Stockholm, and Nuffield College at Oxford University. His graduate textbook, Microeconomic Analysis, is one of the most widely read graduate textbooks in economics. He is the co-author of a best-selling book on business strategy, Information Rules.