Who is he? well it is my friends a mystery, and for what? well if I had a guess or theorize were this man is and who he is would be a mystery to me also. What I do know the system of peer to peer is not new, but the reason he hid his identity would most likely be the fact that he holds so much bitcoin ( 1 million to be exact ). And the worth of all these bitcoin's would have me hiding too mainly because of political reasons. I think at the time of him knowing that this system would be so popular people of the crypto community would have slandered him for pre-mine and trust issues with all that said take a look at this video for a more in depth fundamental and technical point of view.
Best Regards Durian Walker