Jeremy Siegel, while clearly not agreeing with me on all points, urged me to set down my ideas in this book. He is its real instigator. Jeremy has been a lifelong friend. Our families regularly vacation together, and I learned a distinctive approach to finance from him while strolling the beach together or watching our children fish.
John Campbell, my former student, then co-author on a dozen scholarly papers on financial markets, and for years a close friend, has been my intellectual other half in formulating many of the ideas that led to this book. My original work on volatility in financial markets was refined and significantly advanced with his collaboration. He has also offered many helpful suggestions for this book and comments on the manuscript.
Peter Dougherty, my editor at Princeton University Press, has been an extremely important formative influence on the book, helping to define the fundamental aspects of its structure. He has been a great colleague and more—really almost a collaborator. Peter Strupp of Princeton Editorial Associates was an unusually helpful copy editor.