Theodor Holm Nelson
From the WikiPedia:
Theodor Holm Nelson (born 1937) invented the term "hypertext" in 1965, and is a pioneer of information technology. He also coined the words "transclusion" and "intertwingularity".
Nelson is currently a visiting professor at Oxford University, and a philosopher who works in the fields of information, computers, and human-machine interfaces. He founded Project Xanadu in 1960 with the goal of creating such a system on a computer network, further documented in his 1974 book Computer Lib / Dream Machines and the 1981 Literary Machines. Much of his adult life has been devoted to working on Xanadu and advocating it.
Ted Nelson Links:
Embedded Markup Considered Harmful
Orality and Hypertext: An Interview with Ted Nelson