Stewart is from Glasgow and a graduate of the National Film and Television School.
In 2013 Stewart's comedy pilot Skwibs was chosen as one of the prestigious Rocliffe Bafta Comedies. Previously Stewart has been selected to take part in the Channel 4 ‘Coming Up' scheme and was nominated for a Scottish BAFTA for his animated piece Bill's Visitors. He is currently developing a feed for BBC 3.
His feature Beating the Drum is currently being developed by BBC Films and Creative Scotland. Rocket Surgery, a comedy feature has recently been selected for Lo-Fi, the Scottish low-budget film initiative, and will go into production later this year.
Stewart's debut play, Frank's Dead, is part of Òran Mór’s 2014 lunchtime theatre programme, A Play, a Pie and a Pint.