xvi Preface Air Corps whose public use policy allowed me to reproduce their photo as Figure 9.1-4. I am pleased to acknowledge the assistance and advice of my col- leagues Annalisa Calini, Benoit Charbonneau, Tom Ivey, St´ephane Lafortune, Brenton Lemesurier, Hans Lundmark, and Oleg Smirnov. This book would not have been possible without the advice and sup- port of Ed Dunne, Cristin Zannella, Luann Cole, the anonymous ref- erees and the rest of the editorial staff at the AMS. And thanks espe- cially to Emma Previato, my thesis adviser, who originally introduced me to this amazing subject and offered helpful advice regarding an early draft of this book.
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