| Year,Title,Role,Notes
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| 1995,The Tempest,Prospero,"For the New York Shakespeare Festival, with the production later transferring to Broadway"
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| 1997,Othello,Othello,"The Shakespeare Theatre Company's (Washington, D.C.) ""photo negative"" production of a white Othello with an otherwise all-black cast"
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| 2000,The Ride Down Mt. Morgan,Lyman Felt,"On 9 April 2000, Stewart opened in Arthur Miller's The Ride Down Mt. Morgan at the Broadway Ambassador Theatre."
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| 2001,Who
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| 2001,Johnson Over Jordan,Robert Johnson,J.B. Priestley
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| 2003,The Master Builder,Halvard Solness,"Henrik Ibsen's play at the Albery Theatre, London"
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| 2003,The Caretaker,Davies,Harold Pinter
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| 2006,The Tempest,Prospero,At the Royal Shakespeare Theatre and then the Novello Theatre
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| 2006,Antony and Cleopatra,Mark Antony,"At the Swan Theatre, for the Royal Shakespeare Company as part of the cycle performing all Shakespeare's works in a year"
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| 2007,A Christmas Carol,All,By Charles Dickens. Played 40 roles in a one-man performance at the Albery Theatre in the West End of London.
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| 2007,Twelfth Night,Malvolio,At Chichester Festival Theatre
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| 2007,Macbeth,Macbeth,In Rupert Goold
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| 2008,Macbeth,Macbeth,At the Brooklyn Academy of Music in New York City
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| 2008,Macbeth,Macbeth,"At the Lyceum Theatre, New York"
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| 2008,Hamlet,Claudius and the Ghost,Alongside David Tennant as the eponymous Hamlet with the Royal Shakespeare Company in Stratford-upon-Avon. This was later made into a television play and broadcast on BBC1 on 26 December 2009.
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| 2009,Waiting for Godot,Vladimir (Didi),Alongside Ian McKellen as Estragon (Gogo)
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| 2010,Bingo: Scenes of Money and Death,William Shakespeare,"By Edward Bond at the Chichester Festival Theatre, transferring to the Young Vic Theatre in February 2012. This was a role he had first performed in 1976 at The Other Place, Stratford."
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| 2011,The Merchant of Venice,Shylock,In Rupert Goold
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