Lukas Reschke is a security researcher and developer who has responsibly disclosed vulnerabilities and exploits to Google, Apple, GitHub, Microsoft, Owncloud, Tiki Wiki, Facebook, Adobe, Dropbox, Swisscom, svg-edit, etc.
He calls himself an "IT-Security addicted nerd".
Member of the ownCloud security team
http://www.statuscode.ch/about
https://github.com/LukasReschke
https://plus.google.com/104081518879805578375/about