Jack Nutting has been using Cocoa since the olden days, long before it was even called Cocoa. He's used Cocoa and its predecessors to develop software for a wide range of industries and applications including gaming, graphic design, online digital distribution, telecommunications, finance, publishing, and travel. When he's not working on Mac or iPhone projects, he's developing web applications with Ruby on Rails. Jack is a passionate proponent of Objective-C and the Cocoa frameworks; At the drop of a hat, he will speak at length on the virtues of dynamic dispatch and runtime class manipulations to anyone who'll listen (and even to some who won't). He blogs from time to time at www.nuthole.com.