Edit: Stupid html interwhingee code eats the blasted links! All links now posted purely as text. Open a new window and paste them in. Sorry for the extra hassle.
The Thin Man is finally listed on wikipedia but it's a very short entry with a few errors and a derth of information. http://en.wikipedia.org/wiki/M._Keaton Now, I would encourage you to shoot over and update it but the problem is that he's very stingy with information, especially the personal stuff. So, it becomes a mystery--who is the Thin Man, where has he been, what has he done, is he even human? Well, to help, I've tried to complile a list of a few links that might help you find out more (and source the article as well). Not every page has a direct reference to the Thin Man but they all point at some aspect of his past and this just scratches the surface. Have fun looking: