Sebastian Bergmann
Sebastian Bergmann holds a degree in Computer Science and is a pioneer in the field of quality assurance in PHP projects. His test framework PHPUnit is a de-facto standard. He is actively involved in the development of PHP and creator of various development tools. Sebastian Bergmann is an internationally sought-after expert. As an author he shares his long-standing experience in books and articles. He is a frequent speaker at conferences around the world.
Arne Blankerts
Arne Blankerts is a Co-Founder and Principal Consultant with thePHP.cc and head of development at NonFood advertising agency in Hamburg, Germany. Furthermore he offers security consulting and training with thePHP.cc, is a regular author writing articles for the German PHP Magazine, php|architekt and others. Arne is the inventor and lead developer of an open source site system called "fCMS" (http://fcms.de) and in the unusual case of spare time he helps maintaining the German translation of the PHP manual.
Stefan Priebsch
Stefan Priebsch is a Co-Founder and Principal Consultant with thePHP.cc. He holds a degree in computer science and is author of various books and technical articles. As a consultant, he helps customers make better use of PHP, with a focus on software architecture, design patterns, and tools and methods. He served on the advisory board of International PHP Conference in 2008.