Oliver Urs Lenz holds double MSc degrees in Mathematics from Leiden University and the University of Padova (2011), as well as an MA degree in Linguistics from Leiden University (2012). He has worked as a data scientist for three startups in Amsterdam and Oslo, the last of which he co-founded. He is currently a PhD student at Ghent University, funded by the Odysseus Programme of the Flemish Research Foundation (FWO), working mainly on the application of fuzzy rough sets in machine learning with large, imbalanced and/or incompletely labelled datasets.