Guido Grillenmeier is the Principal Technologist of Semperis in EMEA. Based in Germany, Guido has been a Microsoft MVP for Directory Services for 12 years. He spent 20+ years at HP/HPE as Chief Engineer. A frequent presenter at technology conferences and contributor to technical journals, Guido is the co-author of Microsoft Windows Security Fundamentals. Today he is concentrating on cyber-resilience, with a focus on Directory Services – both on-prem and in the cloud – securing companies around the globe.