Guido Grillenmeier, chief technologist at Semperis, is one of the world’s foremost experts on Active Directory (AD) recovery. A well-established industry veteran, Grillenmeier previously worked as chief engineer at HP (now HPE and HP, Inc.) for nearly 20 years, where he was a member of the company’s Advanced Technology Group. While he was there, Grillenmeier led the development and delivery of HP’s Windows Server 2008 Academies to HP’s Services division. Grillenmeier later on served as chief engineer at Hewlett Packard Enterprise (HPE). Most recently, Grillenmeier held the position of chief technologist within the Enterprise Services Group at DXC Technology, a spinoff company from the Enterprise Services division of HPE and CSC.