	Portman has been acting since he was 16 years old. His first role was in 2010's "Outcast", in which he starred as Paul. This was followed by a role in popular Scottish soap opera "River City". His second film role was a small part in Scottish comedy "The Angels' Share". It was announced on 24 August 2011 that he was cast as Podrick Payne in the award-winning HBO fantasy drama series "Game of Thrones". He portrayed this role from the second season to the final season.. He contributed vocals to a version of the track "Jenny's Song" that featured in the second episode of the final season of Game of Thrones.