Maybe he is a close friend of Satoshi Nakamoto that chose him to be the admin of this forum. But I suspect that theymos holds a large amount of bitcoins. And even if someone really knows who is Satoshi is and where he is, it is confidential of course, it could be a great threat to his privacy. Many people including media will surge to his location to ask him many things. As of theymos, maybe we know his name but his location is unknown too due to privacy concerns.
It really doesn't matter who is Satoshi Nakamoto is, just be grateful that there is bitcoin he made and because of it the rising age of cashless society started.