Well obviously no one knows... or very few people know (I still think that there are a couple original bitcoiners on this forum who are 99% sure that they know who Satoshi is).
Whats your favourite theory?
Mine is that it was John Nash

Please provide some proof for your theories. Would love to look into them!
The father of Bitcoin is a god-like existence, the earliest white paper on which Bitcoin was released, and the earliest edition of bitcoin. Numerous people worship his elaborate design ideas and neat code structure, however, but no one has seen him in reality. I think this question can not be answered unless I have seen it with my own eyes, but I really admire the creators of bitcoin.