Antonis Diamantis is a graduate of the Higher School of Dramatic Art of the Athens Conservatory (1986). He has studied Philosophy at the University of Philosophy of Athens and is a graduate of KATTE, Department of Economics Management. He has given theatrical seminars at the Odin Theatre in Denmark, with Eugenio Barba and his actors, with actors from the Jerzy Grotowski Theatrical Workshop and at the Jerzy Grotowski and Thomas Richards Research Center. He is one of the founding members of OMMA STUDIO Theatre (1991). From 1997 - 2000 he was a theatre teacher at the Workshop for actors, an actor in 3 theatrical productions and a kinesiologist at the Experimental Stage of the National Theatre of Greece. He has directed and participated as an actor in more than 35 theatrical plays of the theater OMMA STUDIO, which have been presented in international festivals abroad in Europe, Latin America, Middle East and Africa. In two of them (Russia and Iran) his performance entitled: "Martyrdom" was awarded as the best foreign language theatrical performance. She has organized numerous theatrical seminars at the OMMA STUDIOS theater (Athens and Heraklion, Crete) and has studied theater with Greek and foreign actors and directors.
He has founded the Center of Theatrical Anthropology, where he is also its artistic director (Heraklion, Crete, 2020). The Center has organized so far 3 scientific conferences in collaboration with the Universities of Crete (2021, 2022) and Patras (2023).
With Oma Studios Theatre he has participated as Artistic Director in International European Programs (Creative Europe, Erasmus+).
Since 2009 he has been conducting a research with the actors of the Omma Studio Theatre on the subject of "Relation between Theatre and Ritual" and is presented through the performance opus of Nikos Kazantzakis' "Ascetic".