Eoin was born in Dublin, Ireland, in 1980 to Paul and Karin Dubsky. He moved with his parents, his brother Paul and little sister Julia to Prague (then Czechoslovakia) in 1992, where he quickly got involved in English-language youth drama.
He played a tiny role in this film and a few others which were filmed in the Czech Republic in the mid-90s. He was far more involved in amateur theatre, playing in 'Divadlo v Celetna', 'Divadlo Komedie', 'Divadlo Labyrinth', and of course his school 'Gymnazium Nad Aleji' (room 105!). By late 1996 he returned to Ireland to finish secondary school.