Technical University of Berlin
European Research Fellow, May-August 1996.
Mathematical Sciences Research Institute
Postdoctoral Fellow, 1996-97.
University of Pennsylvania
Hans Rademacher Instructor, 1997-99.
Royal Institute of Technology
Visiting Researcher, 1999-2000.
University of Crete
Assistant Professor, 2002-2006.
Institute Mittag-Leffler
Visitor, January-February and May-June 2005.
University of Athens
Associate Professor, 2006-2010.
University of Athens
Professor, 2010-present.