He co-wrote "Matilda the Musical"—an Olivier Award-winning musical version of Roald Dahl's novel "Matilda"—with Dennis Kelly and produced Royal Shakespeare Company. It premiered at the Courtyard Theatre in Stratford-upon-Avon, running from 9 November 2010 to 30 January 2011, and it began its West End run at the Cambridge Theatre on 25 October 2011 to great critical acclaim. In 2013, "Matilda" opened on Broadway at the Shubert Theatre, and earned 12 Tony Award nominations. The musical has subsequently been presented worldwide winning numerous awards.