This book wouldn't have been possible without the contribution of many individuals, groups, and organizations.

We acknowledge Landmark Education for making its methodology and body of knowledge available to us. We particularly thank its staff, program leaders, and over one million graduates for their inspiring work.

We thank the editor of this series, Warren Bennis, whose passion for the art and science of leadership has motivated us for years. Warren became a champion of this project almost ten years ago and has guided us throughout the entire process from idea to finished manuscript. We will always be grateful to Warren for his advice, editorial direction, commitment to this project, and vision for what it could become.

We appreciate the support from the faculty and staff of the University of Southern California and the Marshall School of Business. Special thanks go to Tom Cummings, Rich Callahan, Tim Campbell, Jim Ellis, and Steve Sample.

We are thankful to John King, through whom we originally met. As one of Dave's partners in CultureSync, John took on extra work to support this project. Likewise, Jack Bennett took on extra responsibilities to allow for the writing of this book.

In a similar vein, we also acknowledge Fred McWilliams and Jim Kidder, who expanded their daily roles to support Steve.

We appreciate the many experts who gave us their time in interviews, including Chris Ahrends, Ray Anderson, Chris Argyris, Joel Bakan, Geoffrey Bellman, Peter Block, Ray Fowler, Kevin Kelly, Rakesh Khurana, Barney Pell, Lewis Pinault, Bob Rosen, Peter Senge, Monica Sharma, Eraldo Tinoco, Margaret Wheatley, and Dan Yankelovich.

We are indebted to many people who invited us into their companies and, in many cases, told us stories that were very personal. The list includes Lee Browne, Malcolm Burns, Paul Fireman, Antoinette Grib, John Hetrick, Isamu Homma, Michael Jensen, Selinah Makgale, Jorge Mattos, Brad Mills, Akio Nakauchi, Keitaro Nakauchi, Seiko Nakauchi, Arunaraje Patil, Larry Pearson, Laolang Phiri, Mal Salter, Ian Sampson, Don Shelton, Burgess Winter, and Doug Young.

We appreciate our Japanese guides and translators, Yumi Fukushima and Atsuko Ueda, and, for her expert translation of materials, Risako Suzuki Robbins. We also thank Takatoshi Ueno for supporting us in our interviews in Japan.

In South Africa, we acknowledge Mari-Louise Schoeman for arranging and coordinating our interviews at Lonmin.

We recognize the efforts of many people who helped turn rough drafts into this finished book. The list includes Richard Brest, Allan Cohen, Rosalie Dillan, Miriam Diesendruck, Joe DiMaggio, Kirsten Fraunces, Virginia Ginsburg, Michael Jensen, Gretchen Knudsen, Mick Leavitt, Olga Loffredi, Harte Logan, Bob Mueller, Maira Navarro, Ann Overton, Brian Regnier, Robert Richman, Sanford Robbins, Rik Super, Diana Toomey-Wilson, and Aaron Zaffron. We also thank Landmark Education's Research, Development, and Design Team for its input.

We acknowledge the contributions of JMW Consulting and especially Jerry Straus. We also acknowledge the contributions of the Insigniam Performance partners: Michael Waldman, Shideh Bina, and Nathan Rosenberg. We also recognize and appreciate a number of other highly effective management consulting firms with whom we have collaborated and whose work has supported the writing of this book.

Some of the material on leadership in this book was developed in what has become a yearly event for the faculty and students of the Simon School of Business at the University of Rochester. We appreciate the positive response and dialogue during class discussions. We especially thank Dean Mark Zupan for his support and advice.

In turning ideas into a final product, we are grateful to our agent, Bob Mecoy, and our executive editor, Susan Williams. We also thank the team at Jossey-Bass, including Rob Brandt, Kristi Hein, Mark Karmendy, Carolyn Carlstroem, and Amy Packard.

For their support of the book, we acknowledge Eileen LaCario, Jennifer Greer, and Linda Graveline.

We appreciate the hundreds of hours contributed by individual members of the Barbados Group, whose names are mentioned in the Authors' Note.

We also thank the staff and consultants of Vanto Group, who demonstrate amazing commitment to their clients, some of which is captured in this book.

For her tireless support, we especially thank Halee Fischer-Wright, who took time away from her medical practice and consulting engagements to manage our collaboration and key aspects of this book. We appreciate her taking all of that on and keeping us focused.

Last, we acknowledge Werner Erhard, the developer of the original ideas on which much of this material is based. We appreciate his commitment, intellectual effort, and support in key aspects of this book.

To the extent that we got it right, we thank all of these individuals. To the extent that we missed the mark, we ask the indulgence of you, the reader.