Karen Cranston is a computational evolutionary biologist in the Department of Biology at Duke University. She is the lead PI of the Open Tree of Life project, which produces a constantly-updating evolutionary tree of all species. The project uses open data, open source software, and motivates community curation of phylogenentic data through services useful for research. Karen is also passionate about training scientists in the skills for open science, both teaching and developing workshops on programming, data science and reproducible science with Data and Software Carpentry. She tweets at @kcranstn.