It was decided early on that Ramis' character would be the brains of the Ghostbusters, Aykroyd's was the heart, and Murray's was the mouth. Aykroyd drew inspiration from Hollywood archetypes, he said: "Put [the characters of Peter Venkman, Raymond Stantz, and Egon Spengler together, and you have the Scarecrow, the Lion, and the Tin Man." Aykroyd's concept called for the Ghostbusters to have a boss and be directed into situations. Ramis preferred they be in control "of their own destiny" and make their own choices. This led to the development of more distinct identities for the characters: Venkman as the cool, modern salesman; Stanz as the honest, enthusiastic technician; and Spengler as the factual, stoic intellectual.