"Jaws" opened in theaters on June 20, 1975. Director Steven Spielberg was 27 at the time. It was filmed mostly on location on Martha's Vineyard, Massachusetts, and had a troubled production. Mechanical sharks malfunctioned, so Spielberg decided to mostly suggest the shark’s on-screen presence though an ominous, minimalistic musical theme by composer John Williams to indicate its impending appearances. This suggestive approach is similar to that of thriller director Alfred Hitchcock. Universal Pictures put the film into a very wide release for a major studio picture, accompanied by an extensive marketing campaign.