Satoshi Nakamoto is the name used by the person or people who created the bitcoin protocol and its reference implementation, Bitcoin Core, and whose identity has long remained a mystery. Following the recent manhunt for the creator, Professor Sirer has been cited in several technology news articles for his opinions on the topic and assures that the identity of the Bitcoin creator(s) is still largely unknown.

Coinspeaker: http://www.coinspeaker.com/2015/12/11/craig-wright-is-not-satoshi-nakamoto-says-cornell-universitys-professor
TechCrunch: http://techcrunch.com/2015/12/10/satoshi-gulch/
MIT Technology Review: http://www.technologyreview.com/view/544431/how-to-spot-bitcoin-inventor-satoshi-nakamoto/
New York Business Journal: http://www.bizjournals.com/newyork/news/2015/12/11/bitcoin-satoshi-nakamoto-wired-gizmodo.html