- historical-comparative linguistics, especially the history and historical contacts of the Finno-Ugric languages
- morphology, word-formation
- minority languages and multilingualism
- Finnic languages
- gender linguistics
International coordinator of VIRSU, applied-linguistic research platform for Finno-Ugric languages as target languages
Leader of the research project Omasta ja vieraasta rakentuminen (Building with things borrowed and new: history and contacts of the Finnic languages), funded by the Academy of Finland.