30-year computer security consultant, instructor, holder of dozens of computer certifications, and author of 10 books and over 1,000 articles. He has worked at some of the world’s largest computer companies, including Foundstone, McAfee, and Microsoft. He has consulted for 100's of companies around the world. He specializes in host and network security, IdM, anti-malware, hackers, honeypots, PKI, cloud security, cryptography, policy, and technical writing. His certifications have included CPA, CISSP, CISA, CISM, CEH, MSCE: Security, Security+, and yada-yada others, and he has been an instructor for many of them. His writings and presentations are often known for their real-world, contrarian views. He has been the weekly security columnist for InfoWorld and CSO magazines since 2005.