Writing a book is an exhilarating journey. One of the best parts is when it is time to acknowledge all those who helped along the way. I would like to particularly thank David Rapoport and John Mueller for our frequent and informative meetings, during which we discussed the issue of lone wolf terrorism. Jean Rosenfeld was an early believer in my ideas about lone wolf terrorism, and I am grateful to her for her support. I am also indebted to Ken Chin, who was invaluable in providing feedback and encouragement throughout this project.

I would also like to thank the following colleagues, friends, and others who helped in many different ways: Richard Antony, Martin Balaban, James Bondurant, David Boren, Molly Boren, William Casey, Melinda Catlett, Sandy Chin, Joe Cirillo, Phil Edney, Jenifer Elzea, Steven Emerson, Bill Fargo, Stephen Fischer Jr., Mark Giuliano, Betsy Glick, Cathy Gonzalez, Theresa Hart Barry, Sharon Hayes, Robert Hitsous, Michael Intriligator, Steven Kafka, Eddie Kamiya, Janet Kamiya, Erica Kelly, Chris Kemp, Ed Kobak, Sherm Lamb, Ira Latto, Sue Moran, Bennett Ramberg, Kathy Schreik, Lorron Snell, Cindy Forrestal-Snell, Douglas Snyder, Shoshana Snyder, Jodi Solomon, Travis Sorrows, Warren Spencer, Nkenge Stocks, Meg Sullivan, Bill Teachworth, Kevin Terpstra, James Tong, Donna Wald, Carole Wood, and Ted Zwicker.

Catherine L. Hensley provided superb editing skills and was a pleasure to work with.

Special thanks goes to Brian Michael Jenkins, who wrote the foreword and who was my mentor when I began studying terrorism many decades ago.

I would also like to thank everybody at Prometheus Books, led by Steven L. Mitchell, the editor in chief, for their enthusiasm for a book on lone wolf terrorism. This includes Jade Zora Ballard, Bruce Carle, Grace M. Conti-Zilsberger, Mark Hall, Jill Maxick, Brian McMahon, Lisa Michalski, Catherine Roberts-Abel, Laura Shelley, and Melissa Raé Shofner.

Nobody could ask for a better agent than Jill Marsal. She championed this book from the beginning and was a constant source of support and encouragement.

Finally, I want to thank Ellen, Richard, Julie, Penya, Jack, Eric, Elijah, Justine, Caleb, and Oscar for being a special part of my life.