On Justin signing his new contract with Glasgow, Sean Lineen said: "Justin adds a real physicality to our game and is very proud to play for Glasgow."
Justin is a powerful prop who is capable of playing on both sides of the scrum. He joined Glasgow Warriors from London Wasps in 2006.
This summer, he has represented Samoa in the IRB Pacific Nations Cup, scoring a try against Japan. The wins over Japan and Tonga helped Samoa to third place behind the Junior All Blacks and Fiji.
He grew up in the town of Wainuiomata, near to Wellington, home to famous rugby union players like Tana Umaga and Piri Weepu. However, Justin started his rugby career playing rugby league, representing Wellington at U16 and U18 before switching to rugby union in 1999.
Following his switch, Justin was selected for the Wellington Academy in 2000 and made the Wellington Colts side in 2001 before progressing to senior rugby and playing at top club level for Upper Hutt and fro NPC side Wellington.
Although he was born in New Zealand, Justin's dad is Samoan, and he chose to play his international rugby for Samoa.
Justin enjoys outdoor sports and going to the pictures, and describes himself as a laid back, relaxed sort of guy!