He also received a nomination for a Tony Award for Best Actor in a Leading Role in a Play as a member of the original Broadway version.

Other theatre credits include King Henry in the 2012 Globe production of Shakespeare's Henry V, with notable film roles being Donald Scripps in The History Boys (2006), adapted by Alan Bennett from his play of the same name in which Parker was a member of the original cast, and Lieutenant Werner von Haeften in Valkyrie (2008).

He also sang several numbers in the Late Night Sinatra concert given by the John Wilson Orchestra during the 2015 BBC Proms season at London's Royal Albert Hall.

In 2015, he appeared alongside his fellow History Boys co-stars in the film adaptation of Alan Bennett's The Lady in the Van.

[11] He reprised his performance on Broadway at the Lyric Theatre in 2018, earning a Tony Award nomination for Best Actor in a Play.

Each episode explored and revealed the extraordinary world and works of William Shakespeare and the still-potent impact they have today.

He also played Mark Antony in BBC Radio 4's production of Julius Caesar, directed by Marc Beeby, first broadcast in July 2018.