Jacob Appelbaum (born 1983) is an American independent journalist, computer security researcher and hacker. He was employed by the University of Washington, and is a core member of the Tor project, a free software network designed to provide online anonymity. Appelbaum is known for representing WikiLeaks at the 2010 HOPE conference. He has subsequently been repeatedly targeted by US law enforcement agencies, who obtained a court order for his Twitter account data, detained him at the US border after trips abroad, and seized a laptop and several mobile phones.
He is currently living in Berlin and he has been contributing extensively as a journalist to the publication of documents revealed by Edward Snowden in June 2013.