Sergio 'flacman' Valderrama has been a coder and hacker since he was in school (15 Years old?). Consulting Manager of 2Secure S.A.S, he has worked as security consultant for more than 6 years. Founder of ColombiaUnderground Team, he studied Computer Engineer at the Universidad de los Andes... (lot of non interesting crap about titles and experience). And of course, he's the main developer of Scylla.