I am a Greek author/academic.

I could suggest mainstream authors but lately, Greek fiction has had its biggest successes in the speculative genre. Authors whose work can be found online in pro magazines are: Eugenia Triantafyllou (Hugo nominee), Christine Lucas, Antony Paschos, Natalia Theodoridou, Kostas Charitos, Dimitra Nikolaidou, Victor Pseftakis etc

Also look for the Nova Hellas science fiction anthology.