Stewart is a writer and Senior Dramaturg at the National Theatre. Alongside his theatre work he also writes audio drama.

Theatre includes: The Wooden Meadow [reading] (Finborough); Trestle (Southwark/Papatango); You Look Tasty!, As You Sow, The Ghost Hunter (& Old Red Lion) (Pleasance, Edinburgh); The Horror! The Horror! (Wilton’s Music Hall).

Awards include: Papatango New Writing Prize (Trestle), OffWestEnd Award for Best Artistic Director.