Sean Metcalf is founder and principal consultant at Trimarc (www.TrimarcSecurity.com), 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 and defense at Black Hat, BSides, DEF CON, DerbyCon, Microsoft BlueHat, Shakacon and Walmart Sp4rkCon security conferences. He currently provides security consulting services to customers and posts interesting Active Directory security information on his blog, ADSecurity.org.