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Mark P. McCahill (born February 7, 1956) is an American programmer who has been involved in developing and popularizing a number of Internet technologies since the late 1980s. He led the development of the Gopher protocol, the effective predecessor of the World Wide Web. He was also the first to use the phrase "surfing the Internet." McCahill currently works at the Office of Information Technology at Duke University as an architect of 3-D learning and collaborative systems.