Stefan holds a PhD in Econometrics from Aarhus University, Center for Research in Econometric Analysis of Time Series (CREATES), a MSc in Economics and Finance (University of Southern Denmark), and a BSc in Business Administration (University of Southern Denmark). He is an experienced R developer and trainer, and has provided several on-site courses for both large companies, within the public sector, and for academic institutions. Stefan has experience from energy and commodity trading and is currently bringing more creativity into the world as a Data Scientist at Redbubble. Stefan has also contributed to the R community with the development of packages—e.g. magrittr (with Hadley Wickham), ensurer, import, and more—and by co-founding two useR groups, CopenhagenR and Rhus.