Elizabeth K. Joseph is a Developer Advocate at Mesosphere focused on DC/OS and Apache Mesos, and runs OpenSourceInfra.org. Previously, she worked for a decade as a Linux Systems Administrator, spending the past four years working at HPE on the OpenStack Infrastructure team. She is the author of Common OpenStack Deployments (2016) The Official Ubuntu Book, 8th (2014) and 9th (2016) editions.