Mark Fenogliohas over 12 years of experience in database and web-based application development in technologies ranging from SQL Server and PostgreSQL to PHP, Ajax, Cocoa, Objective-C, and ASP. He was hired by The Big Nerd Ranch in September 2005 after asking too many annoying questions at the Cocoa Bootcamp that March. To support his PHP development efforts, he has crafted his own PHP application framework.Aaron Hillegass, CEO of Big Nerd Ranch, has more than 18 years of experience as a software engineer and trainer. He is author ofCocoa Programming for Mac OS X, the definitive Cocoa programming guide.