Mike Schiffman, CISSP, has been involved in most every technical arena computer security has to offer. He has researched and developed many cutting edge technologies including tools such as firewalk and tracerx as well as the ubiquitously used low-level packet shaping library libnet. Mike has led audit teams through engagements for fortune 500 companies in the banking, automotive and manufacturing industries. He has spoken in front of several institutions and government agencies such as: NSA, CIA, DOD, AFWIC, SAIC, and army intelligence. Mike is the lead author of Hackers Challenge, and has written for numerous technical journals such as Software Magazine and has written articles for securityfocus.com, and authored many security white papers. Currently, Mike is the Director of Security Architecture for @stake, the leading provider of professional security services. Previous to @stake, Mike was the Director of Research and Development for Guardent, Inc. 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 is 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 Hackers Challenge. David Pollino (Walnut Creek, CA) is a senior security consultant at @stake, Inc. He has extensive networking experience including working for a tier 1 ISP architecting and deploying secure networks for Fortune 500 companies. David leads the @stake Center of Excellence focusing on wireless technologies such as 802.11x, WAP and GPRS. Recent projects include helping design and oversee the security architecture for a large European ASP and assisting with the security architecture for a wireless provider.