William English, who alongside Douglas Engelbart built the first computer with a mouse and showed it at "The Mother of All Demos", dies at 91 (Cade Metz/New York Times)

Cade Metz / New York Times:
William English, who alongside Douglas Engelbart built the first computer with a mouse and showed it at “The Mother of All Demos”, dies at 91  —  He was one of the computing pioneers who “showed what a computer interface could — and should — look like,” a colleague said.