• SECTION OF ASTROPHYSICS, ASTRONOMY & MECHANICS, DEPARTMENT OF PHYSICS, UNIVERSITY OF ATHENS, Athens, Greece
  2020-present: Professor.
• SECTION OF ASTROPHYSICS, ASTRONOMY & MECHANICS, DEPARTMENT OF PHYSICS, UNIVERSITY OF ATHENS, Athens, Greece
  2016-2020: Associate Professor.
• SECTION OF ASTROPHYSICS, ASTRONOMY & MECHANICS, DEPARTMENT OF PHYSICS, UNIVERSITY OF ATHENS, Athens, Greece
  2008-2016: Assistant Professor.
• SECTION OF ASTROPHYSICS, ASTRONOMY & MECHANICS, DEPARTMENT OF PHYSICS, UNIVERSITY OF ATHENS, Athens, Greece
  2003-2008: Lecturer.
• DEPARTMENT OF ASTRONOMY & ASTROPHYSICS AND ENRICO FERMI INSTITUTE, UNIVERSITY OF CHICAGO, Chicago, IL, USA
  2002-2003: Research Associate - Theoretical Astrophysics.
• ENRICO FERMI INSTITUTE AND DEPARTMENT OF ASTRONOMY & ASTROPHYSICS, UNIVERSITY OF CHICAGO, Chicago, IL, USA
  2000-2002: Robert F. McCormick Fellow.
• Military Service, Greece
  1999-2000
• UNIVERSITY OF CRETE, Heraklion, Greece
  1992-1998: Teaching Assistant.
• FOUNDATION OF RESEARCH AND TECHNOLOGY, Heraklion, Greece
  1992-1998: IESL Research Fellow.
• ARISTOTLE UNIVERSITY OF THESSALONIKI, Thessaloniki, Greece
  1992: Teaching Assistant.