Dave Mark is a long-time Mac developer and author and has written a number of books on Macintosh development, including Learn C on the Macintosh, The Macintosh Programming Primer series, and Ultimate Mac Programming. His blog can be found at www.davemark.com. Jeff LaMarche is a longtime Mac developer, and Apple iPhone Developer. With over 20 years of programming experience, he's written on Cocoa and Objective-C for MacTech Magazine, as well as articles for Apple's Developer Technical Services website. He has experience working in Enterprise software, both as a developer for PeopleSoft starting in the late 1990s, and then later as an independent consultant.