He came to the attention of Tony Scott whilst shooting television commercials for the London-based company RSA Films. After working as visual effects cinematographer on Enemy of the State for Tony Scott, Mathieson photographed the film Plunkett & Macleane for Jake Scott.
Mathieson was spotted while filming television commercials for RSA Films in London. Following his work as a visual effects cinematographer on Tony Scott's Enemy of the State, he photographed Jake Scott's film Plunkett & Macleane.