Bitcoin is the first implementation of a concept called
"crypto-currency", which was first described in 1998 by Wei Dai on the
cypherpunks mailing list, suggesting the idea of a new form of money
that uses cryptography to control its creation and transactions, rather
than a central authority.
The first Bitcoin specification and proof of
concept was published in 2009 in a cryptography mailing list by Satoshi
Nakamoto. Satoshi left the project in late 2010 without revealing much
Satoshi's anonymity often raised unjustified concerns, many of which
are linked to misunderstanding of the open-source nature of Bitcoin.
Bitcoin protocol and software are published openly and any developer
around the world can review the code or make their own modified version
of the Bitcoin software.
Just like current developers, Satoshi's influence was limited to the changes he made being adopted by others and therefore he did not control Bitcoin. As such, the identity of Bitcoin's inventor is probably as relevant today as the identity of the person who invented paper.
Source : Bitcoin.org