Russell Pavilcek has spent over two decades evangelizing open source. Since his introduction to Linux in 1995, he has relentlessly promoted the concept of open source to anyone who would listen. Most recently, he was Evangelist for the Xen Project at Citrix, where he became a prominent voice for unikernel technology. Pavilcek is a published book author, has written more than 200 articles, and is the author of the soon-to-be-published  e-book, Unikernels: Beyond containers to the next generation of cloud, from O'Reilly Media. He has spoken more than 100 times at open source conferences, is a former panelist on The Linux Show weekly webcast, and consults with clients on using open source software.