This book would have never happened without the encouragement, help, and advice of Doug Kaye. I've mentioned his original question that motivated the book. He also provided valuable coaching and mentoring, as well as served as the book's first editor. I'm grateful for his guidance and friendship.
Bradford Windley drew the picture of the trebuchet in Chapter 1.
Some portions of Chapter 12, on federating identity, are adapted with permission from Scenarios for Identity Federation & Drivers of the Identity Network by Linda Elliott and Eric Nolin of Ping Identity Corporation, Tom McKenna of SRI Consulting Business Intelligence, and Kevin Werbach of the Supernova Group LLC.
I'm grateful for the help of Gary Daemer of Booz Allen Hamilton who provided valuable information and advice about the maturity model for identity discussed in Chapter 15.
Burton Group and Jamie Lewis, in particular, were very generous in letting me use their ideas in writing Chapter 19 on reference architectures. I'm also grateful to Jamie for agreeing to write the Foreword to this book and for his insights into the state of the art in digital identity systems and technology.
The technical reviewers offered many thoughtful suggestions that greatly improved the final result. I'm thankful for their efforts.
Lastly, I'm grateful to my wife, Lynne, and my children, Bradford, Alexandra, Jacob, Joseph, and Samantha, for their support, help, love, and mostly for their understanding at the many times I had to say "Sorry, I can'tâI've got to work on the book."
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