Director D. W. Griffith joined Biograph in 1908 as a writer and actor, but within months became its principal director. In 1908, the company's head director Wallace McCutcheon grew ill, and his son Wallace McCutcheon Jr. took his place but was not able to make a successful film for the company. As a result of these failed productions, studio head Henry Marvin gave the position of head director to Griffith, whose first film was "The Adventures of Dollie". Griffith helped establish many of the conventions of narrative film, including cross-cutting to show events occurring simultaneously in different places, the flashback, the fade-in/fade-out, the interposition of closeups within a scene, and a moderated acting style more suitable for film. Although Griffith did not invent these techniques, he made them a regular part of the film vocabulary. His prolific output—often one new film a week—and willingness to experiment in many different genres helped the company become a major commercial success. Many early movie stars were Biograph performers, including Mary Pickford, Lionel Barrymore, Lillian Gish, Dorothy Gish, Robert Harron, Arthur V. Johnson, Florence Auer, Robert G. Vignola, Owen Moore, Alan Hale Sr., Florence Lawrence, Blanche Sweet, Harry Carey, James Kirkwood Sr., Mabel Normand, Henry B. Walthall, Mae Marsh, and Dorothy Davenport. Mack Sennett honed his craft as an actor and director of comedies at Biograph. After debuting at Biograph, Mary Pickford also became a top star at the studio and would soon be known to audiences as "The Biograph Girl".