He is best known for his roles as Beric Dondarrion in the HBO television series Game of Thrones and Dan Anderssen in Sky Atlantic's Fortitude.
[3][4] In 2004, Dormer won the Irish Times Best Actor Award for his performance in Frank McGuinness's Observe the Sons of Ulster Marching Towards the Somme and in 2005 completed a season with Sir Peter Hall at the Theatre Royal and starred in Bath as Angelo in William Shakespeare's Measure for Measure, Jean in August Strindberg's Miss Julie and in a production of Samuel Beckett's Waiting for Godot.
[5] Dormer has written a number of plays including The Half and Gentleman's Tea Drinking Society which were produced through Belfast's Ransom theatre company.
[10] In 2020, he played the Director of the Civil Contingencies Secretariat in the Sky drama series, COBRA, starring Robert Carlyle as the British Prime Minister.
[16] Dormer has become a well known television actor, more recently playing key roles in the Cinemax drama series Hunted and BBC One's Hidden.
It also airs on RTÉ in Ireland, ABC Australia, KiKa in Germany, MTV in Finland, NRK in Norway, SVT in Sweden, and HOP!
Described as "their most ambitious project to date", he takes the role of Sheriff Dan Anderssen and stars alongside Stanley Tucci, Michael Gambon, Christopher Eccleston and The Killing's Sofie Gråbøl.
[24] The comedy-drama retells the creation of the popular BBC sitcom Dad's Army as well as the relationship between Croft and Jimmy Perry who became successful TV comedy writers.