[2] Sinclair studied acting at the Ecole Philippe Gaulier in Paris, and went on to a career on the stage in Auckland, as well as roles in a number of New Zealand films including working with Peter Jackson, playing the role of Roger in Braindead and Isildur in The Lord of the Rings.
After The Front Lawn disbanded in 1990, Sinclair directed two short films, Casual Sex, and Avenue Du Maine.
His three feature films were made in an unconventional manner, with Sinclair casting his lead actors before writing the scripts.
From 2006 to 2008 Sinclair collaborated with the New York-based theatre company Builders Association, touring internationally as an actor in their production Super Vision.
writing and directing an animated children's series, Kiri and Lou, for Television New Zealand and the Canadian Broadcasting Corporation.
He is collaborating with animation director Ant Elworthy and composer Don McGlashan, and the series is produced by Fiona Copland.