[2] In 1968 Kollias obtained a jurisprudence degree in Athens, and worked as a lawyer until 1980, when he started to devote his time to studying the linguistic, folkloric and historical traditions of the Arvanites in Greece.

[3] In 1996 Kollias relinquished his position as head of the Arvanite league of Greece organisation to devote his time toward Pelasgian studies.

[4] From 1997 onward he published a tri-monthly magazine titled Arvanon and together with Kosovar acquaintances used the publication to discuss issues such as the Kosovo conflict.

[4] Kollias advocated for the Albanian Kosovar cause by informing the wider public in Greece and also received backlash for his support.

[6] In 1983 Kollias authored a book titled Arvanites and the Origin of Greeks which he reedited several times and was translated into Albanian in 2002.