I would like to thank the many people who contributed to this fifth edition. Gratitude goes to my family for their support and patience. I am thankful to security practitioners, educators, librarians, and others who helped to provide a wealth of information to support the contents of this book. The hardworking Security team at Elsevier, including Amy Pedersen, Pam Chester, Marissa Hederson, Greg deZarn-O’Hare, Jay Donahue, and Alisa Andreola, are to be recognized for their talents and skills in publishing this book. I am grateful for the team effort, among so many people, for without it this book could not be published.