John K has put some must read stuff about Bill Peet on his blog. Bill Peet is one of my favorite story men. When you look at his boards you can see how amazing an story man he was, it's very clear who the characters are and what they're thinking. Well it turns out he was more then a story man, he had his hands in all things. Check it out, I'd consider this a must read:
BTW if you haven't seen his autobiography or his childrens books. Check them out now.