This document provides biographical information about Fabien Potencier and discusses his upcoming presentation titled "PHP 5.3 in practice". It notes that Fabien is the founder of Sensio, a consulting company specialized in web technologies, and the creator of several open source projects including Symfony. The presentation will cover reasons for migrating to PHP 5.3 such as improved speed and lower memory usage, how PHP 5.3 affects design patterns like the singleton, and new features like namespaces and anonymous functions.