Published by Wizards of the Coast.
So far as I know, 1980’s Queen of the Demonweb Pits is artist David C. Sutherland III’s only published example of game/adventure design. It’s also (again, so far as I know) the first official example of planar adventuring for Dungeons & Dragons. Both these facts are important when looking back on this module and its impact.
Read the Full Retrospective/Review at Grognardia.