Atte Kettunen is a security researcher at the Oulu University Secure Programming Group (OUSPG). In 2011 and 2012 he has successfully fuzzed Firefox and Chromium and found dozens of vulnerabilities in them.
He is one of the top reporters in Firefox and Chromium browsers' bug bounty programs.
http://www.chromium.org/Home/chromium-security/hall-of-fame
http://2012.zeronights.org/speakers