Vlassis has a background in Mathematics and Philosophy of Science. His research evolves around bordering, policing, surveillance, and the digitalization of the state. For his PhD thesis, he investigated border guards’ practices and the registration of “irregular” migrants crossing to the European Union through the maritime Greek-Turkish borders. He has conducted research on the Danish Police’s use of data integration platforms and their shift toward Intelligence Led Policing. In his latest research project, he is researching digital and analog border work in the context of the Nordic borders.