Mark Hamstra has worked in cross-platform systems development for many years. Previously, that work was centered mostly on CAD software, systems and consulting. Mark now does data analytics development and consulting, with an emphasis applications of functional programming to Big Data problems. Matei Zaharia is a PhD student in the AMP Lab at UC Berkeley, working on topics in computer systems, cloud computing and big data. He is also a committer on Apache Hadoop and Apache Mesos. At Berkeley, he leads the development of the Spark cluster computing framework, and has also worked on projects including Mesos, the Hadoop Fair Scheduler, Hadoop's straggler detection algorithm, Shark, and multi-resource sharing. Matei got his undergraduate degree at the University of Waterloo in Canada.