The vi editor was developed starting around 1976 by Bill Joy, who was then a graduate student at the University of California at Berkeley. Joy later went on to help found Sun Microsystems and became its Chief Scientist.

https://www.linfo.org/vi/history.html

https://world.hey.com/dhh/wonderful-vi-a1d034d3

https://en.wikipedia.org/wiki/Vi_(text_editor)