THIS BOOK HAS TAKEN many years to research and write. I had plenty of help along the way. I am deeply indebted to several teams of research assistants who worked on the book at various times. Special recognition goes to John Dana Brown, Steve McGuinness, Alexa S. Zanolli, Kirsten Widner, Brad Johnson, Haley Frasca, Charlotte Hasse, Hillery Stones, Naveen S. Gurudevan, Chaney Hall, and Andrew Stine. Tim Carey, an extraordinarily gifted student, and I had wonderful discussions about Marxism that helped me think through some of the themes in critical race theory. The legendary legal scholar Carl Auerbach has been an inspiration to me for many years. Edmund Ursin, Virginia Nolan, and Virginia Shue have been wonderful colleagues and friends for thirty years. My assistant Daniel Reyes provided excellent service, for which I am truly grateful. Charles T. Myers, Mark Bellis, and Susan Ecklund, my editors at Princeton University Press, were simply superb.