Strange things you bump across if Google(*) department: Charlie Stross (now finally achieving success as an SF author) is the creator of those infamous 1st Edition D&D monsters, the Githyanki, Githzerai, Slaadi, and Death Knights, of Fiend Folio fame.
Now, he appears slightly embarrassed of his high-school contribution to the Mythos of RPG fantasy, as evidenced in this interview on a Planescape fan-site.
(Actually, I was looking for the Stross interview/slowtime chat from The Well, but the one on Rakkama certainly illuminated a side of Stross that you won’t easily find by reading his website…)