Tessa Mearns is an Assistant Professor at ICLON Leiden University Graduate School of Teaching. She has a BA in Modern European Languages from the University of Durham and an MA in Applied Linguistics & TESOL from Newcastle University. She completed her PhD entitled Chicken, egg or a bit of both? Motivation in bilingual education (TTO) in the Netherlands at the University of Aberdeen in 2015, while teaching at a bilingual secondary school in Eindhoven. She joined ICLON in 2016 and now coordinates and teaches on the specialised World Teachers Programme track of the teacher education programme for international and bilingual education contexts. Her main research interests are bilingual education, Content and Language Integrated Learning (CLIL), and language motivation. She is a member of the Meesterschapsteam Vakdidactiek Moderne Vreemde Talen, which is cross-university group concerned with strengthening Modern Languages education by bridging the gap between practice and research (https://modernevreemdetalen.vakdidactiekgw.nl/).