Harley Hahn is an internationally recognized writer, analyst and consultant. He is the author of 28 books on various topics, including the best-selling Harley Hahn's Internet Insecurity, Harley Hahn's Internet Yellow Pages, Harley Hahn Teaches the Internet, Harley Hahn's Readme First Guide to the Internet, The Internet Complete Reference, and the highly regarded Assembler Inside & Out. His Unix books include Unix Unbound and Harley Hahn's Student Guide to Unix. Hahn has a degree in mathematics and computer science from the University of Waterloo, Canada, and a graduate degree in computer science from the University of California at San Diego. Before becoming a professional writer, he studied medicine at the University of Toronto Medical School, where he wrote the book Unconventional Medicine Explained. Hahn enjoys writing computer books because "I get to sleep in, and I like telling people what to do." Hahn does not live in a converted farmhouse in Connecticut with his wife, three children, and a Labrador retriever named Rolf. Nor does he commute frequently to New York. His favorite pajamas are light blue.