A wise man once told me that I could not survive in this business unless I surrounded myself with a lot of smart and supportive people. I have had the good fortune to come across both over the years, and it is a pleasure to acknowledge them here.
I owe my greatest intellectual debt to John Mearsheimer, who taught me everything I know about being a scholar. He has been a formidable critic, an unfailing supporter, and a good friend. Robert Pape was a constant source of ideas and had more faith in my abilities than I did. I am grateful for his insights and enthusiasm. Carles Boix and Duncan Snidal helped sharpen my arguments and provided encouragement every step of the way.
I am profoundly grateful to Michael Creswell, John Deak, Michael Desch, Alex Downes, Mark Gilbert, Michael Horowitz, Keir Lieber, Piers Ludlow, Michelle Murray, John Schuessler, Dominic Tierney, and my two reviewers, one of whom turned out to be Robert Art, for reading and commenting on the entire manuscript and on parts of it more than once. This book is immeasurably better for all of their efforts.
For comments and conversations that had a significant effect on my thinking as I worked on the project, I thank Nick Biziouras, Olivier Brighenti, Jasen Castillo, Maria Fanis, Frank Gavin, Charles Glaser, Seth Jones, Jenna Jordan, Dong Sun Lee, Charles Lipson, James McAllister, Timothy McKeown, Kathleen McNamara, John Owen, Craig Parsons, Mark Sheetz, Paul Staniland, Milan Svolik, Robert Trager, Lora Viola, Stephen Walt, Alexander Wendt, Joel Westra, Mark Wilson, and especially Marc Trachtenberg. My thanks also to Kathy Anderson, Cheri Gray, Susan Lynch, and Ann Townes for looking after me along the way. I am very grateful to Roger Haydon for shepherding me through the entire process at Cornell University Press, Ange Romeo-Hall for patiently guiding me through editing and (p.xii) production, and Mary McGovern for superb last-minute editing. My apologies to anyone I forgot.
I have had the good fortune to be invited to present my ideas at the Program on International Security Policy and the Program on International Politics, Economics, and Security at the University of Chicago, the Belfer Center for Science and International Affairs and the John M. Olin Institute for Strategic Studies at Harvard University, the European Union Center of Excellence at the University of Pittsburgh, the Security Studies Program at the Massachusetts Institute of Technology, the Burkle Seminar on Global Affairs at the University of California, Los Angeles, the Triangle Institute for Security Studies, and the Lone Star National Security Forum. I am grateful to all the participants at these workshops and seminars for their excellent questions and suggestions.
For invaluable research assistance, I am indebted to Andrew Bertoli, Mark Bond, Robert Brathwaite, Carol Hendrickson, Nicholas Houpt, Jacqueline Kallberg, Colleen Noonan, Maria Petnuch, Charles Ramsey, Michael Rowley, and Colleen Walter. Thanks are also due to the students who took my classes at the University of Chicago, the University of Notre Dame, and in Rome for debating many of the issues in this book with me before my own views were fully formed.
Despite these many intellectual debts, I alone am responsible for any remaining errors in the book.
I could not have written this book without the generous financial and logistical support I received from the Program on International Security Policy at the University of Chicago, the John M. Olin Institute for Strategic Studies and the Belfer Center for Science and International Affairs at Harvard University, and the Nanovic Institute for European Studies, the Institute for Scholarship in the Liberal Arts, and the Joan B. Kroc Institute for International Peace Studies at the University of Notre Dame. I am very grateful to everyone associated with these wonderful institutions, and especially Agustín Fuentes, A. James McAdams, Steven Miller, Daniel Phil-pott, Stephen Rosen, and Monica Duffy Toft.
I dedicate this book to my parents, Pasquale and Judith, who have been a constant source of love, support, and advice. I aspire to be the kind of parent that they have been to me. I would also be remiss if I did not thank my brothers, William and Michael, for keeping things in perspective.
Last but by no means least, I thank my girls. My daughters, Anna and Olivia, serve as a much-needed reminder that there is a lot more to life than my work. They are my pride and joy. Most of all, though, I thank my wife, Susan, without whom none of this would have been possible. She is my inspiration and my best friend. The next one is for her.