As an under 18 Australian Rules player, he represented the ACT in the Teal Cup but later switched codes to Rugby, playing 1st grade both for his school and the ANU.
In 2009, Grierson was invited to the Avatar set during shooting by James Cameron, and was selected to direct a 3D cave-diving drama Sanctum, using the Cameron-developed Fusion Camera System.
[2] The script is inspired by the near-death experience of one of the writers, Andrew Wight, who was trapped in a cave collapse under the Nullarbor Plain.
It was shot at Warner Roadshow Studios on the Queensland Gold Coast, and the film opened 4 February 2011.
Mickey Rourke plays Frank Donovan in the film, which is produced by Mary Aloe,[10] and co-stars Pugliese, Singh and Janel Parrish.