Born in Athens, in 1966, Antonitsis studied mechanical engineering at the Zurich ETH and the Rensselaer Polytechnic Institute in Troy, New York (Master of Science), where he specialised in the high-speed microscopic photography of vortex rings.
He won an award for his short film Past Glories, Present Despondencies, a collaboration with Robert De Niro's production company.
He is the founder and curator of Hydra School Projects, an international platform for the visual arts and the HSP Residency Program.
Held annually since 2000, the Hydra School Projects, named because these contemporary art exhibitions are shown at the old Hydra High School, showcase the work of up-and-coming, young Greek as well as international artists alongside those already well established.
The exhibition is housed in local public schools or other spaces such as hotels, town squares, and the Merchant Marine Academy.