Simon's work includes Encourage the Others at the Almeida, After the End for the Citizens Theatre, the 2010 Season for Pitlochry Festival Theatre, the award winning Slick, Bright Black and The Not-So-Fatal Death of Grandpa Fredo for Vox Motus, Honk! at the Royal, Northampton A Sheep Called Skye for the National Theatre of Scotland, The Visit for Dundee Rep; Feelgood for Nottingham Playhouse, A Sense of Justice and Mary's Wedding for Perth Theatre; The Glass Menagerie, The Secret Garden, Mary's Wedding, Cat on A Hot Tin Roof, Honk! and A Christmas Carol for the Byre Theatre of St Andrews; Meat and The Play O' The Wather for Nutshell; Spoonface Steinberg, Manick Company; Ghost Shirt, Theatre by Design; Lion in the Streets and Touch Bass, Arches Theatre; Better Days ... Better Knights, Fifth Estate;
Simon lit the first four national tours of Mum's the Word, the tribute musical Always ... Patsy Cline, three tours of A Happy Medium, and the Scottish tours of The Odd Couple, Tally's Blood, Dead Funny, Good Things and Passing Places
Simon designed the lighting for the award winning Last Supper of Dr Faustus, and his design for Lion in the Streets was exhibited as part of the Society of British Theatre Designers 2D-3D exhibition. He had a place in the Guinness Book of Records for his design for Act 24's production of Oklahoma at the Edinburgh Playhouse, which created the record for "Fastest Theatrical Production"
Simon was nominated for Best Design for Slick at the 2009 Critics Awards for Theatre in Scotland. The production went on to win in the Best Technical Presentation category. Bright Black has been nominated in the same category for the 2010 awards.