Katariina Harjunpää is an Academy Research Fellow and Associate Professor of Finnish at Tampere University, Finland. Her research centers on language and grammar in interaction, multimodality, participation dynamics, and distributed agency, with a particular focus on third-party-mediated interactions. In the field of multilingual interaction, she has published studies on non-professional interpreting in everyday interaction and Aikido instruction. She currently leads the research project “Unpacking Speakership in Mediation,” which features a substudy on professional interpreting in criminal case mediation.