Sean Metcalf is founder & principal consultant at Trimarc (Trimarc.io), a professional services company which focuses on improving enterprise security. He is one of about 100 people in the world who holds the Microsoft Certified Master Directory Services (MCM) certification, is a Microsoft MVP, and has presented on Active Directory attack & defense at many security conferences (Black Hat, DEFCON, DerbyCon, etc). He currently provides security consulting services to customers and posts interesting Active Directory security information at ADSecurity.org.