Film producers are responsible for financing films and supervising the filmmaking process, including finding distributors. Film distributors market and promote films to sell them. Common UK film production companies include BBC Films, Working Title Films, DNA Films, and Vertigo Films. Directors oversee all aspects of filmmaking, while producers handle financial aspects and finding distributors. Camera operators shoot footage under the direction of the cinematographer. Editors work with directors to assemble footage and add effects to meet time limits.