Welcome to my website

I am an associate professor at the Faculty of Electrical Engineering and Computer Science at the Leibniz University Hannover and member of the L3S Research Center. My research lies in the areas of Data Mining, Machine Learning and Data Science and can be summarized as learning over complex data and data streams.

Prior to joining LUH, I was a post-doctoral researcher at the Ludwig-Maximilians-University (LMU) in Munich, Germany under the supervision of Prof. Hans-Peter Kriegel. I joined the group in 2010 as a post-doctoral fellow of the Alexander von Humboldt Foundation. I obtained my PhD from the Department of Informatics of University of Piraeus, Greece, under the supervision of Prof. Yannis Theodoridis. I hold a diploma in Computer Engineering & Informatics and an MSc in Computer Science, both from the Computer Engineering & Informatics Department (CEID), University of Patras, Greece.

Latest news:
-> I will attend the 8th AcademiaNet Dialogue Forum, on 7-8 November 2017 in Berlin.
-> I am organizing the Dagstuhl Perspectives Workshop "10 years of Web Science: Closing the Loop", which will take place on 24-29 June 2018.
-> 20.10.2017: I will give a talk on "Learning with limited labels (over streams)." 4th Int. Alexandria Workshop, Hannover.
-> 29.9.2017: I will give an invited talk on "Sentiment Analysis of Social Media Content " at the EUMade4All Workshop, Hannover.
-> 11.9.2017: I will give an invited talk on "Data Augmentation for Machine Learning" at KDML 2017.
-> "Large scale sentiment annotation with limited labels." accepted at KDD 2017.
-> (1) Multi-aspect Entity-centric Analysis of Big Social Media Archives and (2) Sentiment Classification over Opinionated Data Streams through Informed Model Adaptation accepted at TPDL 2017.
-> "Redundancies in Data and their Effect on the Evaluation of Recommendation Systems: A Case Study on the Amazon Reviews Datasets" accepted at SDM, Houston, Texas, 2017.
-> "Opinion Stream Classification with Ensembles and Active leaRners - OSCAR" project accepted by DFG.