Mark is the Director, Cloud Computing Community, at Citrix where he is responsible for driving all of the community efforts around the company's open source cloud computing project, CloudStack. Before that he was the force behind the Zenoss Core open source management projects adoption and community involvement, growing community membership to over 100,000 members. He is a co-founder of both the Open Source Management Consortium and the Desktop Linux Consortium, has served as Editor-in-Chief for both LinuxWorld Magazine and Enterprise Open Source Magazine, and authored the book, "Windows to Linux Business Desktop Migration." (Thomson, 2006) Mark has also held executive positions at a number of technology start-ups, including Earthlink, (previously MindSpring).