Stewart is a writer, director and dramaturg. He scripted Islander, which was selected for the Made In Scotland 2019 showcase and was recently broadcast on BBC Radio 4. 

His other scripts include Distance Remaining (Digital Tour), Seesaw (Unicorn Theatre/ Haya Arts Center/ National Theatre of Greece), Time Lapse (Southwark Playhouse), Phoenix and Turtle (Little Angel Theatre) and Two Endless Minutes (Young Vic). Adaptations for the stage include A Boy and a Bear in a Boat (Spark Arts).

Direction includes See Me Now (Outside Edge Theatre Company), Woolwich Tales (Tramshed) and Everyday Heroes (Kani Multicultural Centre, Japan). He has worked as a dramaturg with the Royal Shakespeare Company, Bristol Old Vic, Hull Truck, Ovalhouse and Arcola Theatre.