Gary started out his professional career as a chemist/materials engineer. His start down the path to the Dark Side of Computing began when he wrote a program to design an optimal extruder screw rather than face thousands of calculations with a slide rule (yes, a slide rule.) Since then, he's done a lot of different things in computing: microprocessor cross assemblers and simulators, disk device drivers, communication device drivers, TCP/IP hacking and multi-threaded printer spoolers. Always a glutton for punishment, he wrote his own sendmail.cf from scratch. Around 1993, Gary started doing computer security when the semiconductor company he was working for was forced to get on the Internet to send/receive Integrated Circuit designs faster and a firewall/Internet gateway was needed. Since then, Gary's been involved in firewalls, intrusion detection and analysis, vulnerability assessments, system and application hardening, and anti-spam filters. Gary really does computer security to support his bicycling habit. He has more bikes than most other people have computers. And they're a lot more expensive. Gary says "Bikes are like computers: both can crash, sometimes with disastrous results to the user."