 From January to July 2014, Boxer played the role of Gloucester in William Shakespeare's "King Lear".Between October 2016 to March 2017, he worked with From Software to voice the character and boss enemy Slave Knight Gael in the video game "Dark Souls III", specifically its DLC "Ashes of Ariandel" and "The Ringed City".He recently played Captain Rivers in the stage adaptation of Pat Barker's Booker-prize nominated novel "Regeneration".