Dirk-jan is one of the core researchers of Active Directory and Azure AD at Fox-IT. Amongst the open source tools published to advance the state of AD research are aclpwn, krbrelayx, mitm6 and a Python port of BloodHound. He blogs at dirkjanm.io, where he publishes about new Active Directory attack chains, which included the discovery of the PrivExchange vulnerability. He is also co-author of ntlmrelayx and contributor to several other open source tools and libraries. He presented previously at TROOPERS, DEF CON and BlueHat and was part of the 75 MSRC most valuable researchers 2018/2019 through his Azure AD research.