Jürgen Jaspers is Professor of Dutch linguistics and sociolinguistics at the Université Libre de Bruxelles (ULB), Belgium. He publishes widely on classroom interaction, urban multilingualism, language variation, and language policy and ideology. He is co-editor (with Eva Codó) of Multilingua. Journal of Cross-cultural and Interlanguage Communication, and has edited various special issues and book volumes, including Critical perspectives on linguistic fixity and fluidity (2019, Routledge, with Lian Malai Madsen).