Simon is best known for his acclaimed interpretation of Jean Valjean in Cameron Mackintosh's production of Les Misérables for which he received the 2015 Helpmann award for Best Male Actor in a Musical.

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His stage credits include Jolson, Shout, Mamma Mia (Helpmann Award nomination), Eureka, Chess (Greenroom Award nomination) Love Never Dies (Helpmann and Sydney Theatre Award nominations)