- Co-founded the game development company Ion Storm after quitting Id Software, because he felt the artistic nature of the games worked on at Id were given less attention than the technical aspects of the games.
- Originally believed that Ion Storm could produce Daikatana in only 7 months. In the end, he and his crew needed more than 4 years to finish the game, because many coders and designers left the company during development.
- Now, after his second company "Monkeystone Games" wasn't that successful, he and his old-time friend Tom Hall start their own company
- KingsIsle Entertainment.
- No relation to George Romero.
- John Romero created the term "deathmatch" to describe player-vs-player mode in DOOM.
- John is of Yaqui heritage on his father's side and Cherokee heritage on his mother's side.
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