Neel Mehta
The Google researcher who found Heartbleed and then would rather not talk about it.
Mehta was on Google's security team in March 2014 when he found the flaw in OpenSSL's heartbeat code — at the same time as Finland's Codenomicon found it independently. His report to the OpenSSL project led to the disclosure of Heartbleed on 7 April. He donated his Internet Bug Bounty reward to the Freedom of the Press Foundation.
He gave almost no interviews, which made him an odd face for the year's biggest security story. In 2017 he resurfaced with a tweet containing nothing but two hashes and a line of code: an overlap between the WannaCry ransomware and malware tied to the Lazarus Group. It was the first public hint that North Korea was behind it — attribution in 140 characters.