John Marlin has been with Microsoft since April 1992 (22 years) and was in the original Cluster Group that started with NT 4. John delivers High Availability (Cluster/Hyper-V) Training to both internal groups as well as to external partners and delivered Failover Clustering sessions at multiple TechEd conferences (last in 2011). He has written articles for both Windows IT Magazine and TechNet Magazine and is a regular contributor to the AskCore Blog Site. He has also contributed to the books "Introducing Windows Server 2012", "Optimizing and Troubleshooting Hyper-V Storage", and "HyperV in Windows Server 2012R2". As a part of the current support group John is in, he deals with Clustering, Storage, and Virtualization. He also handles interoperability issues with Networking and Active Directory.