Documentaries have evolved significantly since the early 1900s. Early documentaries from the 1920s, such as Moana and The Battle of San Pietro, were filmed in black and white using poor quality cameras and audio. By the 1990s, documentaries had improved audio quality and some began to use color film. Modern documentaries from 2002 onward generally use high definition cameras, though some directors employ older styles to suit historic topics like the 2012 documentary Jack the Ripper. The pioneering filmmaker John Grierson is considered the father of documentary film for coining the term "documentary" and establishing the genre in the 1920s.