My research focuses on data mining and algorithmic data analysis. I am particular interested in algorithms for graphs, social-network analysis, and algorithms for web-scale data.I joined Aalto University in January 2013. I am the director of the Algorithmic Data Analysis (ADA) programme in Helsinki Institute for Information technology (HIIT), and I am leading the Data Mining group in the Department of Computer Science of Aalto University.Before coming to Aalto I was a senior research scientist in Yahoo! Research, and previously an Academy of Finland postdoctoral scientist in the University of Helsinki. During my doctorate studies I had the pleasure to work as a summer intern in Microsoft Research, AT&T Labs, and Bell Labs Lucent Technologies.