Among other islands of the Dodecanese group, it was occupied by Italy for more than 30 years, giving rise to fascist-era rationalist architecture that is unique to the area.
But the island's modern image is closely associated with the local mental asylum, which was the scene of a major scandal involving the serious neglect of patients in the early 1990s.
'IMMENSE' THERAPEUTIC GAIN
Georgiou says it was precisely the shock of the scandal that prompted the reforms which gave rise to the cooperative.
"The reforms launched more than 20 years ago radically changed the way patients are treated, with a view to de-institutionalising asylums," adds Giannis Loukas, a former director of the Leros psychiatric centre.
The therapeutic gain for patients is "immense", he notes.
They can also enjoy the rights of employees instead of working illegally, as was the case for a long time in Leros and elsewhere in Greece, he adds.
While some patients live in the asylum, a large number are allowed to live in flats on the island for better integration into society, Loukas adds.