Marcin Kosiński has a master degree in Mathematical Statistics and Data Analysis specialty and for the last 30 months (till March 2017) he was working in the Research and Development Department at the biggest polish news web portal, wp.pl (Virtual Poland Group). Challenges seeker and big R package enthusiast. Currently keen on the field of large-scale online learning and various approaches to personalized news article recommendation. Co-organizer of the +1300 members R Enthusiasts meetups in Warsaw and main organizer of the Polish R Users Conference 2017 called 'Why R? 2017' (whyr.pl). Interested in R packages development and survival analysis models. He worked as a subject matter expert at +3000 members Data Crunchers Online R Course at The Warsaw School of Data Analysis. In January 2017, Marcin has started his own R+stats freelancing company.