I would like to thank my publisher, Kristin Cochrane; my editor, Amy Black, for her customary support and insight; and Janice Weaver, for a painstaking copy edit.
I am grateful to my children, Dylan, Megan, and Brendan Bell, for reading the manuscript and offering feedback; and especially to Ting-xing Ye for editorial help and, more, for the kind of faith and encouragement that every writer needs.