I am grateful for the support and enthusiasm I received from HCI for this new edition, particularly from Carol Rosenberg and Candace Johnson. Candace’s skillful editing has made the book more readable. Many of my colleagues have been supportive and encouraging of this book, including Drs. Patrick Carnes, John Friel, Richard Gartner, and Martha Turner, as well as Judith Matheny, Charlie Risien, Carol Ross, and Doug Sorenson. My friends John Bullard, Alexander Morgan, and Carl Schuman have always supported and encouraged my writing. Finally, my wife Cheryl’s editing, assistance, and support has been invaluable. I am grateful to them all.