Dugald Bruce Lockhart was educated at Sedbergh School and the University of St Andrews, then trained for a career in acting at the Royal Academy of Dramatic Art.
Lockhart began as a stage actor, working with the Royal Shakespeare Company, the National Theatre and others.
He is also an associate of the Teatre Akadèmia Theatre Company in Barcelona and has directed Romeo and Juliet and As You Like It in Catalan, using new translations by Miquel Desclot.
He played David Cameron in The Three Lions, a comedy written by William Gaminara, a role for which he was nominated as best actor by The Stage at the Edinburgh Festival of 2013.
Lockhart returned to the role when the play was later staged at the St James Theatre, London, in 2015, and stayed with the production when it moved on to the Liverpool Playhouse.