This book could not have been written without the great people at Apress. Steve Weiss responded within hours to my e-mail inquiry, two days after the Google Development Kit (GDK) Sneak Peek was released in November 2013, about writing a Google Glass development book. Michelle Lowman, the lead editor for iOS/electronics and robotics, offered great support and understanding throughout the book planning and writing. Louise Corrigan helped tremendously on the book proposal and contract. Kevin Shea, the book’s coordinating editor, did a wonderful job communicating and scheduling each milestone. Douglas Pundick, the developmental editor, helped with a lot of terrific feedback on how to improve the book content. Thank you so much, Michelle, Kevin, and Douglas, for keeping the book on the right track. Kim Wimpsett, the book’s copy editor, did an amazing job of correcting so many mistakes in my writing. Anna Ishchenko, the cover designer, magically turned the poor picture I took of my Glass into something beautiful, among other things. To all the great folks at Apress, you have my deep, heartfelt appreciation for helping make one of my big dreams come true.

A very special thank-you goes to the greatly talented technical reviewer, Andres Calvo. Andres provided countless excellent suggestions and comments and tested all the GDK and Mirror API code in the book. I feel so lucky to have Andres as the book’s technical reviewer.

John Rodley also did a good job reviewing the first two chapters of the book. James Wu reviewed and tested the iOS code in Chapter 7. Thanks, John and James, for your comments and help.

My 82-year-old father, who introduced me to the computer programming world so many years ago, collected and forwarded to me, using the popular WeChat app, many great articles on Google Glass and wearable computing. Dad, thanks for showing me what “Never too old to learn” means.

Finally, thanks to Lisa, Mark, and Sophia for their unwavering support during my book-writing months. Now I’m about to be running out of excuses for skipping parties, hiking, shopping, games, and travel. First, bring in the 2014 World Cup Brazil!