Michael K. Johnson is an operating system engineer at Specifix. He was formerly an operating system developer for Red Hat, where he managed the kernel team for three and a half years, and was founding technical leader of the Fedora Project. He occasionally teaches full-day tutorials on Linux application development.

Erik W. Troan, cofounder and Executive VP of Operating Systems at Specifix, was formerly Vice President of Product Engineering at Red Hat, where he was responsible for specifying and building technologies such as RPM, Linux operating systems, the Red Hat Network, high-performance Web servers, and the infrastructure for Red Hat's Web site.

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ThriftBooks is a fully independent seller of used books, having sold more than 160 million used and new books since we started in 2003. Each quality used book is sorted, graded, shelved and shipped by hand by our team of dedicated employees in our seven warehouses across the US. We have the best selection of books, in the right condition and format, at everyday low prices. We also have a dedicated, US-based Customer Service team, ranked in the top three by Newsweek for Best Customer Service in 2018 and 2019, so you can shop with confidence. We support and invest in our employees, appreciate and value our customers, and truly believe in the power of the written word to educate, energize, and engage readers of all ages and interests.

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