Don Poulton (A+, MCSA, MCSE, Network+, Security+) has been involved with computers since the days of 80-column punch cards. After a career of more than 20 years in environmental science, Don switched careers and trained as a Windows NT 4.0 MCSE. He has been involved in consulting with a couple of small training providers as a technical writer, during which time he wrote training and exam prep materials for Windows NT 4.0, Windows 2000 and Windows XP. Don has contributed to various certification texts for iLearning/LANWrights, including the "MCSE Windows Server 2003 Active Directory Infrastructure 70-294 Training Guide" and the "70-299 Implementing and Administering Security in a Windows Server 2003 Network Exam Cram 2" books.