Tuukka Ruotsalo joins the User Interfaces group as a research fellow. His research is in the intersection of interactive machine learning, computational human-computer interaction, and interactive information retrieval. He obtained his PhD in 2010 from Aalto University and was a post doctoral scholar at UC Berkeley, Harvard University, and University of Helsinki. Tuukka is also a head of interactive machine learning at research spinoff companies Etsimo and Etsimo Healthcare.