Jason was born in Dublin. He graduated from Trinity College Dublin after studying at the Samuel Beckett Centre, Trinity College.

 

His first job was the lead in a BBC Film called O Mary This London (1994), a part which required him to run for half a mile naked down Camden High Street for one of his opening scenes.

 

After this movie he relocated to London and has appeared in many more films and TV series. He is married to actress Nicola Charles whom he met on the set of the Australian black comedy Muggers (2000). They have two daughters one born in January 2005 named Freya and Nova born July 2007