Bill Pennington Bill Pennington, (CISSP), is a Principal Security Consultant with Guardent Inc. Bill has five years of professional experience in information security, ten in information technology. He is familiar with Linux, Solaris, Windows, and OpenBSD, and i a Certified Information Security Systems Practitioner, Certified Cisco Network Administrator (CCNA), Certified Internet Security Specialist (CISS), and a Microsoft Certified Product Specialist, Windows NT 4.0. He has broad experience in computer forensics, installing and maintaining VPNs, Cisco Pix firewalls, IDS, and in monitoring systems. Bill was a contributing author to several chapters of the original Hacker’s Challenge. Read More Read Less