Joan Keller Stern's name first appeared in the film industry in 1967 when she was in the comedy horror film Spider Baby by Jack Hill, in a small role as Aunt Martha, and worked in the costume area for it.
In 1969, Keller Stern appeared as the producer of the short documentary film The Magic Machines, for whose production she was awarded an Oscar.
The film presents the work of the sculptor Robert Gilbert, who creates kinetic and mechanical machines from scrap parts, which he then paints.
Keller Selznick has since made a name for herself as a socialite and host of dinner parties for high-ranking personalities.
1967: Spider Baby (actress who played Aunt Martha and worker in costume area) 1969: The Magic Machines (documentary short film; producer)