Arne Bäumler studies information technologies at the University of Applied Sciences in Regensburg, Germany. He is interested in IT-security and network technologies. During his first practical semester at Feilner-IT, he was concerned with research, programming, testing, and rolling out Linux solutions.

Norbert Graf is a professional IT specialist in Munich with many years of experience in network security and groupware (both on Windows and Linux). His special fields of interest include Linux Firewalls, Windows-Linux cooperation for groupware, and Samba.

Markus Heller has many years of industrial working experience in open source, security, and network engineering. As an author and reviewer he has contributed to many publications and articles. He regularly teaches classes on scripting languages and computational linguistics at Munich University, where he is working on his doctorate.