Ed Skoudis is a SANS instructor, co-founder of InGuardians, and the founder of Counter Hack Challenges. He authored and regularly teaches the SANS courses on network penetration testing (Security 560) and incident response (Security 504). He has spoken at various hacking and security courses too. He has published numerous articles on computer security topics as well as the Prentice Hall best sellers Counter Hack Reloaded and Malware: Fighting Malicious Code.