Inventor of Perl, patch, rn and some other very useful stuff. He received the white camel award, FSF Award and "Dr. Dobbs Journal Excellence in Programming Award" for that and is a two time champion of the "International Obfuscated C Code Contest". Of course he tries to be a genius once again, be serving as the chief language designer of Perl 6. He is also the author of the STD.pm and viv.
This guy has a lot of humor and insights which can be experiences during his talkes. For more infos please visit his page or his wikipedia article.