Leon Brocard (a.k.a. acme) is an orange-loving Perl/Parrot Eurohacker with many varied contributions to the Perl community, including the GraphViz module on the CPAN. YAPC::Europe was all his fault. He is still looking for a Perl Monger group he can start which begins with the letter 'D.'
Sessions by Conference
O'Reilly European Open Source Convention 2005
O'Reilly Open Source Convention 2005
O'Reilly Open Source Convention 2003
O'Reilly Open Source Software Convention 2002
O'Reilly Open Source Software Convention 2001