Kimmo Bergius

Mark G. Sobell is president of Sobell Associates Inc., a consulting firm that specializes in UNIX/Linux training, support, and custom software development. He is the author of many best-selling UNIX and Linux books and has more than twenty-five years of experience working with UNIX and Linux.

Peter Seebach, a freelance writer specializing in UNIX development, has published dozens of technical articles for IBM developerWorks.