Matt is a huge proponent of WordPress and regularly contributes to the WordPress community. He is the author of several popular themes and plugins, and has made substantial contributions to the official WordPress Codex.
Q&A for professional and enthusiast programmers
Q&A for WordPress developers and administrators
Q&A for Ubuntu users and developers
Q&A for computer enthusiasts and power users
Q&A for professional system and network administrators
Q&A for power users of Apple hardware and software
Q&A for Graphic Design professionals, students, and enthusiasts