Costakis was born in Pera Melana in Arcadia, a Tsakonian-speaking village. He taught at several high schools in Athens before taking a post at the Academy of Athens, serving as a contributor to the Historical Lexicon. In addition to his linguistic works, he also published a volume on the traditional architecture of Tsakonia.
- A Brief Grammar of the Tsakonian Dialect, The French Institute of Athens, Athens: 1951.
- Tsakonian Popular Architecture, The Academy of Athens, Athens: 1961.
- The Tsakonian of Propontis, The Academy of Athens, Athens: 1979.
- Lexicon of the Tsakonian Dialect, The Academy of Athens: 1986.
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