Not only inventor of the computer mouse, but he performed one of the first public introductions of interactive personal computing, word processing, and hypertext in the "mother of all demos"... in 1968.
http://blog.sfgate.com/techchron/2013/07/03/doug-englebart-a-computing-giant-passes-away/
http://blog.sfgate.com/techchron/2013/07/03/doug-englebart-a-computing-giant-passes-away/