The authors would like to thank the many people who made this book possible. Kenyon Brown at Wiley has been a wonderful partner through many books over the years. Carole Jelen, our agent, worked on a myriad of logistic details and handled the business side of the book with her usual grace and commitment to excellence. Chris Crayton, our technical editor, pointed out many opportunities to improve our work and deliver a high-quality final product. Kezia Endsley served as developmental editor and managed the project smoothly. Thank you to Runzhi “Tom” Song, Mike's research assistant at Notre Dame, who spent hours proofreading our final copy. Many other people we'll never meet worked behind the scenes to make this book a success.