• RiSE Seminar, TU Wien, 25th Oktober 2011 

• GREAT Economic and Algorithmic Theory Workshop, July 25-29 

• Innovations in Algorithmic Game Theory workshop, 22-26 May 2011, Hebrew University of Jerusalem 

• Innovation Center Secure Business Austria, Vienna, 10th May 2011 

• Workshop on Logic and Computer Science, Kurt Gödel Research Center, Wien, 25th March 2011 

• ADFOCS '10 (11th Max-Plank Advanced Course on the Foundations of Computer Science) August 2010, Saarbrücken, Germany. 

• 5th Athens Colloquium on Algorithms and Complexity (ACAC '10), National Technical University of Athens 

• Univesität Wien, November 19, 2009 

• 4th Athens Colloquium on Algorithms and Complexity (ACAC '09), August 2008, Athens University of Economics and Business. 

• TU Berlin, Germany, May 19, 2010

• Bertinoro Workshop on Frontiers of Algorithmic Mechanism Design, 15th March 2010

• University of Liverpool, UK, November 3, 2009 

• IDSIA (Istituto Dalle Molle di Studi sull'Intelligenza Artificiale), March 27, 2009, Lugano, Switzerland. 

• EPFL (Ecole Polytechnique Fédéral de Lausanne), February 2, 2009, Switzerland. 

• 3rd Athens Colloquium on Algorithms and Complexity (ACAC '08), August 2008, University of Athens. 

• AEOLUS Fall Workshop, 13 September 2007, Research Academic Computer Technology Institute (CTI) Patras, Greece. 

• 2nd Athens Colloquium on Algorithms and Complexity (ACAC '07), August 2007, National Technical University of Athens.