Tennis for Two (1958) - William Higinbotham

Tennis For Two gameplay, displayed on an oscilloscope

William "Willy" Higinbotham, physicist and creator of Tennis for Two

Exhibit at the Brookhaven National Laboratory where Tennis for Two was displayed in 1958

Sources:

"Best Tennis for Two GIFs" Gfycat https://gfycat.com/gifs/search/tennis+for+two

"Tennis for Two in 1958" Wikimedia Commons, https://commons.wikimedia.org/wiki/File:Tennis_For_Two_in_1958.jpg

"William 'Willy' Higinbotham" Atomic Heritage Foundation, https://www.atomicheritage.org/profile/william-willy-higinbotham