Simon designs lighting for theatre in all shapes, sizes and locations.
For the National Theatre of Scotland, he lit The 306: Dawn, Dragon (with Vox Motus and Tianjin People's Art Theatre, China), The Day I Swapped My Dad for Two Goldfish, Roman Bridge, Truant and A Sheep Called Skye. For Vox Motus, his designs include Dragon, The Infamous Brothers Davenport (with the Royal Lyceum, Edinburgh), The Not-So-Fatal Death of Grandpa Fredo, Bright Black and the multi-award winning Slick. Work for Magnetic North includes Kora (with Dundee Rep), Sex and God, Pass the Spoon, Wild Life and After Mary Rose.
Other theatre designs include God of Carnage and This Wide Night (Tron Theatre, Glasgow); Black Beauty, Grain in the Blood and Tracks of the Winter Bear (Traverse Theatre); The Iliad, The Weir, The Lion the Witch and The Wardrobe, Hedda Gabler, The Caucasian Chalk Circle, The BFG, Bondagers, A Christmas Carol and Cinderella (Royal Lyceum, Edinburgh); Light Boxes and Dr Stirlingshire's Discovery (Grid Iron); Fisk, The Lost Things and Feral (Tortoise in a Nutshell); Citizen (Plan B); Pondlife (Catherine Wheels); The Rise and Inevitable Fall of Lucas Petit (Sleeping Warrior); Blow Off (Julia Taudevin); Dance of Death (Candice Edmunds), Grounded (Firebrand); Moonbeam on a Cat's Ear and In Her Shadows(Jabuti Theatre); After The End and Topdog / Underdog (Citizens Theatre, Glasgow); 13 Sunken Years (Stellar Quines and Lung Ha); Chalk Farm and The Static (ThickSkin); HeLa and Skewered Snails (Iron Oxide); Whatever Gets You Through the Night (The Arches); My Name is Rachel Corrie (Mull Theatre); The Mark of Zorro and The Hunted (Visible Fictions); PUSH (Curious Seed); Honk! (Royal & Derngate) and Encourage The Others (Almeida Theatre). He lit the 2010 season for Pitlochry Festival Theatre.
Simon won, with Jamie Vartan, the 2015 CATS Award for Best Design for Bondagers. Over the years, his lighting has created a Guinness World Record, brought 30,000 people to a windswept Highland Forest, and caused reports of an alien invasion.