William von Hagen holds degrees in computer science, English writing, and art history. William has worked with UNIX systems since 1982, during which time he has been a system administrator, systems programmer, software developer, development manager, computing facilities operations manager, writer, documentation manager, and (now) content manager. William has written a number of books, including Linux Filesystems, Installing Red Hat Linux 7, and SGML For Dummies, and he contributed to writing Red Hat 7 Unleashed. He coauthored Mac OS X Power User's Guide with Brian Proffitt. William has written articles and software reviews for publications including Linux Magazine, Linux Format (UK), Maximum Linux, Mac Tech Magazine, Mac Home Magazine, and Mac Directory, and he has written extensive online material for CMP Media, Linux Planet, and Corel.