Screenwriter and director Brad Bird conceived Violet as “a teenage girl who just wants to be invisible”. In early drafts of the screenplay, Violet was depicted as an infant as opposed to a teenager, since parents Bob and Helen Parr were originally intended to be introduced as retired superheroes who had just begun to attempt to live normal lives much earlier during the film. Violet is voiced by American author and actress Sarah Vowell, who related that she was offered the role unexpectedly. While beginning to cast the film’s main characters, Bird had been listening to the National Public Radio program This American Life, to which Vowell is a frequent contributor. During one of Vowell’s regular appearances on the show, Bird heard her contribute an anecdote about a cannon she had helped her father, a gunsmith, build. Bird wanted to cast Vowell based on her description of the event, deciding that she was “perfect” for the role, which he immediately called to offer her. Vowell had already earned a reputation for declining several voice acting jobs prior to The Incredibles, to the point at which her agent warned Bird not to waste his time. However, Vowell states that she simply avoided pursuing voice roles in general because she was content being a writer and found few animated projects particularly interesting prior to The Incredibles.