Antonis has graduated from Essex Law School as well as from the Department of Sociology of Panteion University. He has also completed his postgraduate studies in Maritime Law at the University of Southampton. He is a member of Piraeus Bar Association as of 2016. His working experience is divided into both shipping specialized law firms and maritime companies. He currently works as Head of the Registration Department in Palau International Ship Registry. From 2016 he has been teaching Admiralty Law and Law of the Sea in the department of Nautical Education offered by New York College.