Mark G. Sobell, author of many best-selling books, including A Practical Guide to Fedora and Red Hat Enterprise Linux, Sixth Edition, A Practical Guide to Ubuntu Linux, Third Edition, and A Practical Guide to Linux Commands, Editors, and Shell Programming, Third Edition (all from Prentice Hall), has more than thirty years of experience working with UNIX and Linux. He is the president of Sobell Associates Inc., a consulting firm that designs and builds custom software applications for UNIX and Linux systems and provides training and support.

Mr. Sobell started working with computers part time after high-school where he worked on the Dartmouth Time-sharing system where they developed the BASIC programming language and on IBM OS/360 systems. He started writing when he worked for microcomputer company Cromemco in the late 1970's. He published his first book (A Practical Guide to UNIX) in 1982 and started Sobell Associates in 1984. He has been writing and consulting ever since.

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