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John S. Quarterman is Senior Technical Partner at Texas InternetConsulting, which consults in networks and open systems with particular emphasis on TCP/IP networks, UNIX systems, and standards.He is the author of The Matrix: Computer Networks and Conferencing Systems Worldwide (Digital Press, 1990), and is a coauthor of UNIX, POSIX, and Open Systems: The Open Standards Puzzle (1993), Practical Internetworking with TCP/IP and UNIX (1993), The Internet Connection: System Connectivity and Configuration (1994), and The E-Mail Companion: Communicating Effectively via the Internet and Other Global Networks (1994), all published by Addison-Wesley. He is editor of Matrix News, a monthly newsletter about issues that cross network, geographic, and political boundaries, and of Matrix Maps Quarterly; both are published by Matrix Information and Directory Services, Inc. (MIDS) of Austin, Texas. He is a partner in Zilker Internet Park, which provides Internet access from Austin. He and his wife, Gretchen Quarterman, split their time among his home in Austin, hers in Buffalo, New York, and various other locations.