Auction (VII) - Kay Nielsen
I have previously written about him (first here, then here and here), announcing a new book about him, which has since been delayed and delayed. I can see it is now scheduled for October 2011. Over four years late...
I admit I like the above Fantasia storyboards for the Night on Bald Mountain sequence more than the horseman concept for that same sequence:
[But no: none of Nielsen's works sold!]