PBS
Pbs: Who Made America?: Innovators: Joseph Wilson
A businessman with an eye for innovations and the patience to research them, Wilson reinvented the Haloid Company as Xerox and made its name synonymous with photocopying.
Other
Western Illinois University: Hypertext: Douglas Engelbart
This article on Douglas Engelbart includes links to further related information.
Massachusetts Institute of Technology
Mit: Inventor of the Week: Chester Carlson
Massachusetts Institute of Technology provides interesting information on Chester F. Carlson, the inventor of the photocopier. The site provides good background on the history of the photocopier, and a photo of Carlson.