Martha Sif Karrebæk is Associate Professor in the Department of Nordic Studies and Linguistics at the University of Copenhagen. She has conducted research on multilingualism and mobility in Denmark for almost 15 years. She received her PhD on a study of language socialization, play and (second) language acquisition in pre-school and continued to look at language socialization among school-starters in a public school characterized by great diversity. Subsequently, she was principal investigator on a project on mother tongue and heritage language education in Copenhagen. Karrebæk is also well-known for her innovative work on food and language.