Sebastián Castro (@r4wd3r) is the Technical & Research Leader at CSL Labs. Born in Bogotá, Colombia, has been an information security researcher, network & application pentester and red-teamer for 6 years, providing cybersecurity services to global financial institutions and local defense government organizations. This guy has presented at national and international conferences, such as BSides, ISC² and recently Black Hat, exposing password cracking and Windows security own research. Sometimes tenor, sometimes hacker, Sebastián also works as an opera singer at Opera of Colombia Chorus, participating on many national and international fancy performances with well-known singers whose names he can't even spell.