The correct answer is Douglas Engelbart. Douglas Engelbart, an American inventor whose work beginning in the 1950s led to his patent for the computer mouse, the development of the basic graphical user interface (GUI), and groupware. Douglas Engelbart invented the computer mouse in 1963€“64 as part of an experiment to find a better way to point and click on a display screen. Fashioned at the Stanford Research Institute, it had a carved wood casing and just one button. A subsequent model had three buttons, and Engelbart would have provided more if there had been room for more than the three microswitches to which the buttons were connected. Hence, the correct answer is Douglas Engelbart.