Sebastian BergmannSebastian Bergmann studies Computer Science at the University of Bonn in Germany . and spends his free time developing Free Software. A member of the PHP and Gentoo Linux development teams and author of a variety of PHP software projects, including PPUnit and phpOpenTracker, he writes for both print and online media and is a frequent speaker at conferences. In January 2005, Sebastian published his first book ("Professionelle Softwareentwicklung mit PHP 5"5") with the German dpunkt.verlag GmbH. Read More Read Less