Michael Jang (RHCE, Linux+, LCP, MCSE) is currently a full-time writer, specializing in operating systems and networks. His experience with computers goes back to the days of jumbled punch cards. He is the author of a definitive guide to the most popular Linux distribution, Mastering Red Hat Linux 9 (Sybex). His other Linux books include Mastering Linux, Second Edition (Sybex) and Linux Networking Clearly Explained (Morgan-Kaufmann). He also writes books on Linux certification, including the best-selling Red Hat Certified Engineer Linux Study Guide (Osborne/McGraw-Hill), Linux+ Exam Cram (Coriolis), and Sair GNU/Linux Installation and Configuration Exam Cram (Coriolis). He has also written or contributed to books on Microsoft Operating Systems, including MCSE Guide to Microsoft Windows 98 (Course Technology), Exam Prep for Windows 98 (Coriolis), Exam Prep for IIS 4 (Coriolis), and Mastering Windows XP Professional, Second Edition (Sybex).