Dagfinn Reiersol has been designing and developing web applications, web content mining software, web programming tools, and text analysis programs, mostly in PHP, since 1997. He also has a long history as a technical writer of software manuals. He lives in Oslo, Norway.
Chris Shiflett, an internationally recognized expert in the field of PHP security, is the founder and President of Brain Bulb, a PHP consultancy. Chris has been developing web applications with PHP for several years and regularly speaks at OSCON, ApacheCon, and PHP users conferences in North America. He is the author of the HTTP Developer's Handbook (Sams) and writes frequently about web application security. As an open source advocate, he maintains several open source projects and is a member of the PHP development team.