I am deeply grateful to Michael Katz, my dear friend and agent, and to my excellent editor, Leslie Meredith. I am also grateful to Chana Bloch and John Tarrant for their many useful suggestions; to Benjamin R. Foster for generously pointing out some mistakes and misunderstandings on my part; to Martha Levin, Carissa Hays, Cassie Dendurent Nelson, Paul O’Halloran, and Phil Metcalf of Free Press for taking good care of the book; to Eric Fuentecilla, Joel Avirom, and Jason Snyder, the designers who made it so beautiful; and to Katie, for everything.