Immanuel Wallerstein is a Senior Research Scholar at Yale University and Director of the Fernand Braudel Center at Binghamton University. Among his many books are The Modern World-System (three volumes); The End of the World as We Know It: Social Science for the Twenty-first Century; Utopistics: Or, Historical Choices of the Twenty-first Century; and Unthinking Social Science: The Limits of Nineteenth-Century Paradigms. He is the recipient of the American Sociological Association’s Career of Distinguished Scholarship Award and is a former president of the International Sociological Association.