Duncan works primarily with Service Providers and large Enterprise customers. He is focused on designing Public Cloud Infrastructures and specializes in bc-dr, vCloud and VMware HA. Duncan is a VMware Certified Professional and among the first VMware Certified Design Experts (VCDX 007). Duncan is the owner of Yellow-Bricks.com, one of the leading VMware/virtualization blogs worldwide (recently voted number 1 worldwide on vsphere-land.com) and co-author of the "vSphere Quick Start Guide" and "Foundation for Cloud Computing with VMware vSphere 4," which has recently been published by Usenix/Sage (#21 in the Short Topics Series). He can be followed on twitter at http://twitter.com/DuncanYB.