Someone using the name Satoshi Nakamoto. Nobody knows who Satoshi really is, whether one person or a group.
Go deeperSatoshi worked on Bitcoin publicly for about two years, then handed the project to other developers and stepped away from public view in April 2011. Coins believed to be Satoshi's, estimated at around a million, have never moved. Many Bitcoiners see Satoshi's disappearance as a gift: there's no founder to pressure or follow.