Mark is an Apache Software Foundation committer for Apache CloudStack and a member of its Project Management Committee (PMC). He served as vice president of community at, acquired by Citrix, and went on to run the Citrix Open Source Business Office. As a steward for Citrix open source efforts, he sat on the Xen Project Board of Advisors. Earlier in his career, Mark drove marketing strategy and execution at Zenoss. This resulted in widespread community growth and commercial adoption of the Zenoss Core open source project. He has also served as the Editor in Chief of both Enterprise Open Source and LinuxWorld Magazines.