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In his 20-plus years in the computer industry, Ed Tittel has written or co-written more than 100 technical books and many thousands of Web and magazine articles. Ed is a full-time freelance writer, researcher, and consultant who makes most of his living tracking security and certification topics, then finding interesting things to say about them. Ed has been teaching online since the mid-90s. He is also technology editor for Certification Magazine, runs Pearson Publishing's Certificate Reference Guide site, and writes newsletters on certification and information security topics.