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!
Satoshi Nakamoto is still a mystery to the world, nobody really knows who is he. We only know the internet rumors that the name used by the unknown person or people who developed bitcoin and authored the bitcoin whitepaper in initial development stages, he also created and deployed bitcoin original reference implementation. In the process, they were the first to solve the double-spending problem for digital currency using a peer-to-peer network.