Yannis received his Diploma in Physics from the University of Athens, his MSc in Computer Science from University College London, and his PhD in Informatics from the National Technical University of Athens. He worked as a software engineer at a private company (1993-1997), as a research associate at the National Center for Scientific Research "Demokritos" (1998-2003), and as a visiting professor at the University of Thessaly and the University of Central Greece (2004-2006). Since 2007 he is a researcher at the Institute for the Management of Information Systems of the Research Center "Athena".
He has participated as a developer and technical manager in many research, commercial, and consulting projects. His research interests include: methods and tools for supporting data analysis on Social Media, complex changes in evolving interrelated data on the Web, context-dependent Web data.