By the end of 1975, only 9 people had been credited as designers of a published role-playing game. As far as I can tell, 2-4 of them are still alive.
💀 Gary Gygax (D&D, Boot Hill)
💀 Dave Arneson (D&D)
💀 Brian Blume (Boot Hill)
💀 M. A. R. Barker (Empire of the Petal Throne)
☀️ Frank Chadwick (En...