Sidney G. Winter is the Deloitte and Touche Professor of Management, Emeritus, at The Wharton School of the University of Pennsylvania. During his career he has held regular or visiting appointments at seven universities, served on the staffs of the U.S. General Accounting Office, the RAND Corporation and the U.S. Council of Economic Advisers, been a consultant for various governmental and non-profit organizations, and appeared as an expert witness in antitrust and other litigation. With Richard Nelson, he co-authored An Evolutionary Theory of Economic Change (1982). His recent research focus has been on the study of management problems from the viewpoint of evolutionary economics. He is an elected fellow of the Econometric Society and of the American Association for the Advancement of Science. Sidney Winter is a graduate of Swarthmore College, and received his doctorate in economics from Yale University. He is also a member of the SMS Fellows.