Stewart has an extensive theater career and has performed in Live Like Pigs and Road at the Royal Court; Racing Demon, Major Barbara, Sergeant Musgraves Dance, A Month in the Country and In The Blue at the National Theatre; and The Orphans Comedy and Lucys Play at the Edinburgh Traverse.
Television credits include Looking After Jo Jo, Spender, Down Among the Big Boys, Boon, Dream Baby, Only Fools and Horses, Anthony and Cleopatra, The Professionals, Mackenzie, Shadows on Our Skin and Soldiers Talking Cleanly.