First and foremost we would like to thank Joe Conway for his work on the early editions of this book. He authored the first three editions and contributed greatly to the fourth edition as well. Many of the words in this book are still his, and for that, we are very grateful.

A couple other people went above and beyond with their help on this book. They are Amit Bijlani, Chris Downie, Chris Morris, Jacob Bullock, Juan Pablo Claude, Mikey Ward, and Zachary Waldowski.

The other instructors who teach the iOS Bootcamp feed us a never-ending stream of suggestions and corrections. Over the years, they have included Ben Scheirman, Bolot Kerimbaev, Brian Hardy, Chris Downie, Chris Morris, Drew Kreuzman, Gabe Hoffman, JJ Manton, Jacob Bullock, John Gallagher, Jonathan Blocksom, Joseph Dixon, Juan Pablo Claude, Mark Dalrymple, Matt Bezark, Matt Mathias, Mike Zornek, Mikey Ward, Pouria Almassi, Robert Edwards, Rod Strougo, Scott Ritchie, Step Christopher, Thomas Ward, TJ Usiyan, Tom Harrington, and Zachary Waldowski. These instructors were often aided by their students in finding book errata, so many thanks are due to all the students who attend the iOS Bootcamp.

Thanks to all the employees at Big Nerd Ranch who helped review the book, provided suggestions, and found errata.

Our tireless editor, Elizabeth Holaday, took our distracted mumblings and made them into readable prose.

Simone Payment jumped in to provide proofing.

Ellie Volckhausen designed the cover. (The photo is of the bottom bracket of a bicycle frame.)

Chris Loper at IntelligentEnglish.com designed and produced the print and ebook versions of the book.

The amazing team at Pearson Technology Group that has patiently guided us through the business end of book publishing.