John has over 25 years experience in the IT and security sector. He is an often sought management consultant for large enterprise and is currently a member of the Federal Communication Commission's Homeland Security Network Reliabiltiy and Interoperability Council Focus Group on Cybersecurity, working in the Voice over Internet Protocol workgroup.William M. Hancock, PhD, CISSP, CISM, is VP of Security and Chief Security Officer of Cable & Wireless, one of the largest telecom and hosting companies in the world. He has over 30 years of experience in networking, security and related technologies and is the author of many books and articles on security, networking and technology strategy.