Ivan Sutherland is an American computer scientist who is most famously known as the creator of the first GUI (Graphical User Interface). One of his creations is Sketchpad, a program that allows users to interact with a screen in real time using a light pen!
Visit these sites to learn even more!
https://computerhistory.org/blog/the-remarkable-ivan-sutherland/
https://history-computer.com/ivan-sutherland-complete-biography/
https://amturing.acm.org/award_winners/sutherland_3467412.cfm