Martin Freiss, after a degree in electrical engineering, decided to do something else and started his working life in UNIX development at Nixdorf Computer AG, writing IP stacks. As soon as he got the chance, he went into Internet administration, looking after the company's mail, news, WWW and DNS servers, protecting them from abuse and generally fiddling with everything having to do with networking on the Internet. He is currently at the Competence Center IT Networks department of Siemens Nixdorf Information Systems Inc. in Cologne, Germany, where his time is evenly divided between consulting on network security and Internet service and providing and giving seminars and workshops on these topics.