Frederik Vos, living in Purmerend, a city near Amsterdam in the Netherlands, works as a senior technical trainer of virtualization technologies, such as Citrix XenServer, and VMware vSphere. He specializes in data center infrastructures (hypervisor, network, and storage) and cloud computing (CloudStack, CloudPlatform, OpenStack, and Azure). He is also a Linux trainer and evangelist. He has a lot of knowledge as a teacher and also real-world experience as a system administrator. For the last three years he has been working as a freelance trainer and consultant within the ITGilde Cooperation, delivering many Linux training, such as Linux on Azure training for the Linux Foundation.