brendan mccloskey
Saddened to learn of this only this morning, if you study HCI or, well, use computers, then his name is well-known:
http://dougengelbart.org/
http://sloan.stanford.edu/MouseSite/1968Demo.html#complete
Brendan
. . . don't exactly have our finger on the pulse here in Ballygowan. DuckDuckGo told me.