Richard Wagner is a Senior Developer at Maark, LLC. He is an experienced web designer and developer and the author of several web-related books that discuss the underlying technologies of the iPhone application platform.

Wei-Meng Lee is a technologist and founder of Developer Learning Solutions (http://www.learn2develop.net), a technology company specializing in hands-on training for the latest Microsoft and Mac OS X technologies, including the first iPhone programming course in Singapore.

Michael Trent has been programming in Objective-C and Macs for more than a decade. A regular contributor to Steven Frank's www.cocoadev.com website, technical reviewer for numerous books and magazine articles, and a contributor to Mac OS X open source projects,  currently he is using Objective-C and Apple Computer's Cocoa frameworks to build professional and consumer applications for Mac OS X.

Drew McCormack previously programs regularly in Python, C++, Objective-C, Fortran, and Bash, and in his spare time develops the Cocoa financial software Trade Strategist (www.trade-strategist.com).

James Bucanek is a professional software engineer with over 25 years of programming experience. He has developed for Apple computers since its inception. James is recognized for having written numerous technical articles on Mac OS X development for Apple Computer, and as a contributing author for several Mac OS X books, and technical editor for several more. James is currently involved in full time development of native applications for Mac OS X.