Since then his roles have included Sordo in Scenes from an Execution at the Royal National Theatre, Lysander in A Midsummer Night's Dream, Bill Taylor in the Michael Frayn farce Donkeys' Years, Jack Worthing in The Importance of Being Earnest and Judah in Joseph and the Amazing Technicolor Dreamcoat.
His recent work includes the National Theatre production Great Britain by Richard Bean in the ensemble multi-character role of Jimmy the Bins/ St.
[6] He played the lead role of Michael in a revival of Mart Crowley's The Boys in the Band at the Park Theatre (London) and on a short UK tour in autumn 2016.
His performance led to him being nominated as Best Actor in the Whatsonstage.com theatre awards, alongside Ian McKellen, Jamie Parker, Kenneth Branagh, and Ralph Fiennes.
Hallard co-wrote The Big Four (2013) with Mark Gatiss for the ITV series Agatha Christie: Poirot, starring David Suchet.