Tim is the CEO of Red Siege, a company focused on offensive security, penetration testing, and red teaming. Tim is also a Senior Instructor and course author (SEC560) at The SANS Institute. Through the course of his career, Tim has performed penetration tests on a wide range of organizations and technologies. Tim has gained information security experience in a variety of industries including previous positions in control systems, higher education, financial services, and manufacturing. Tim is an experienced international speaker, having presented to organizations around the world. Tim is the creator of the Kerberoasting, a widely utilized Red Team penetration test technique to extract Kerberos tickets in order to offline attack the password of enterprise service accounts.