Paul Farquhar
Legend
Most talented toddler in all of literature!
As I said in my original post, the dates are for when they where published, not birth and death. Reading up on Stanley Weinbaum, his story is sad. He published a story that was at the time highly acclaimed, then died of cancer shortly after.
I'm not sure what he has to do with D&D though - his story was science fiction, not fantasy.