Andrew Hudson is a regular freelance contributor to Linux Format, the UK's largest Linux magazine. Paul Hudson is a professional developer and full-time journalist for Future Publishing. His articles have appeared in Mac Format, PC Answers, PC Format, PC Plus, and Linux Format. Tammy Fox has more than eight years of experience as a Linux professional writer, and five years engineering experience on the Red Hat team. As leader of Red Hat's documentation group, she wrote and revised the official Red Hat Enterprise System Administration Guide. She is founding editor of Red Hat Magazine, an online publication targeted at system administrators and others interested in Linux and open source.