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Mark P. McCahill (born February 7, 1956) has been involved in developing and popularizing a number of Internet technologies since the late 1980s.
Mark McCahill received a BA in Chemistry at the University of Minnesota in 1979, spent one year doing analytical environmental chemistry, and then joined the University of Minnesota Computer Center's microcomputer support group as an Apple II and CDC Cyber programmer.
In 1989, McCahill lead the team at the University of Minnesota that developed one of the first popular Internet e-mail clients POPmail for the Macintosh (and later the PC). The marriage of graphical user interface clients and internet standards-based protocols proved to be one of the dominant themes in the popularization of the Internet. At about the same time as POPmail was being developed, Steve Dorner at the University of Illinois at Urbana-Champaign developed Eudora, and the user interface conventions found in these early efforts continue to be present in modern-day e-mail clients.
In 1991, McCahill led the original Internet Gopher development team (Farhad Anklesaria, Paul Lindner, Dan Torrey, Bob Alberti) and helped invent a simple way to navigate distributed information resources on the Internet. Gopher's menu-based hypermedia combined with full-text search engines paved the way for the popularization of the Web and was the de-facto standard for Internet information systems in the early to mid 1990s. Working with other pioneers such as Tim Berners-Lee, Marc Andreessen, Alan Emtage and Peter J. Deutsch (creators of Archie) and Jon Postel, McCahill was involved in creating and codifing the standard for Uniform Resource Locators (URLs).
In 1994-95 McCahill's team developed GopherVR, a 3D user interface to Internet Gopher to explore how spatial metaphors could be used to organize information and create social spaces. While there was significant interest in the mid-1990s in 3D Internet-enabled information/social spaces (see VRML), the limitied capabilities of mainstream hardware resulted in little uptake of these technologies. Mark McCahill is currently involved in the Croquet project along with David P. Reed, Andreas Raab, David A Smith, Julian Lombardi, and Alan Kay.
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"Mark P. McCahill"