I think alot of us here have some sort of connection with Avalon Hill's Rise and Decline of the Third Reich in some sort of capacity.
RockyMountain Navy Gamer has a thoughtful write up about John's career.
https://rockymountainnavy.com/2022/11/30/wargame-wednesday-fair-winds-and-following-seas-rip-john-prados/ (https://rockymountainnavy.com/2022/11/30/wargame-wednesday-fair-winds-and-following-seas-rip-john-prados/)
And an expanded obituary in the NYT. (behind a paywall)
https://www.nytimes.com/2022/12/03/books/john-prados-dead.html (https://www.nytimes.com/2022/12/03/books/john-prados-dead.html)