David J. Coulson is an IT Consultant in the City of Cleveland, specializing in deployment of Linux, Unix and Cisco environments. A Linux user, developer and advocate of 10 years, David has contributed to many Open Source projects, including IPTables, User-Mode-Linux and Debian, as well as the Linux kernel itself. David also contributes to numerous IT journals, including Linux Format and Linux.Com, and is also the President of the Linux Users Group of Cleveland.