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Brian Marick was a Lisp and C programmer in the 80's, a testing consultant in the 90's, and an Agile consultant in the 00's. This decade he's a Clojure and Ruby programmer as well as an explorer of odd business models. He was one of the authors of the Manifesto for Agile Software Development and is the author of three books (The Craft of Software Testing, Everyday Scripting with Ruby, and Programming Cocoa with Ruby/).