Mark G. Sobell, author of many best-selling books, including A Practical Guide to the UNIX System, UNIX System V: A Practical Guide, A Practical Guide to Solaris, A Practical Guide to Linux, and A Practical Guide to Red Hat Linux (all from Addison Wesley), as well as A Practical Guide to Red Hat Linux, Third Edition and A Practical Guide to Linux Commands, Editors, and Shell Programming (both from Prentice Hall), has more than twenty-five 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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