David Joseph Manners was a Canadian-American actor who played John Harker in Tod Browning's 1931 horror classic Dracula, which starred Bela Lugosi in the title role. The following year, Manners portrayed the archaeologist Frank Whemple in The Mummy (1932), another pre-Code thriller by Universal Pictures.

Jonathan Harker is a fictional character and one of the main protagonists of Bram Stoker's 1897 Gothic horror novel Dracula. An English solicitor, his journey to Transylvania and encounter with the vampire Count Dracula and his Brides at Castle Dracula constitutes the dramatic opening scenes in the novel and most of the film adaptations.