Mark trained at RADA and at The Chrysalis Theatre School. He is the Artistic Director of Shakespeare's Globe and Phoebus’ Cart Theatre Company. He is also an Associate Artist of the RSC. The Citizen's Theatre (Glasgow) gave him his first job in 1980 and since then he has worked with the RSC, Royal National Theatre, Royal Opera House, Scottish Ballet, Shared Experience, Bush Theatre, Tricycle Theatre and London Theatre of the Imagination. After Thelma Holt's production of Much Ado About Nothing, he received the Olivier Award for Best Actor. In the Globe's Prologue Season in 1996 he played Proteus in The Two Gentlemen of Verona. In 1997 Mark played Henry V in the Globe's Opening Season. In 1998 he played Bassanio in The Merchant of Venice and Hippolito in Thomas Dekker's The Honest Whore. The 400th Anniversary 1999 Season saw Mark as Master of Play for Julius Caesar as well as playing Cleopatra in Antony and Cleopatra. For the 2000 season he played the titular role in Hamlet and appeared in The Antipodes, and in 2001 he played Posthumous/Cloten in Cymbeline. Mark received an Olivier nomination for his performance as Olivia in Twelfth Night (2002 season), and last season he played the titular role in Richard II. Film credits include Prospero's Books, Angels and Insects, Hearts of Fire and Intimacy.