Warren Robinett

If you played Adventure, on the atari, back in the day; and ever meet up with Warren Robinett, give him some money, or at least buy him a coffee or beer and souvlaki

https://en.wikipedia.org/wiki/Adventure_(1980_video_game)

"As a result of conflicts with Atari's management which denied giving public credit for programmers, Robinett programmed a secret room that contained his name within the game, only found by players after the game shipped and Robinett had left Atari."

http://www.warrenrobinett.com/