The Producer is one of the most fundamental of all film set roles. It’s one of many film crew job titles that can carry any part of a wide range of responsibilities, but, primarily, producers are responsible for securing funding, setting a project into motion, and providing high level organizational guidelines.
In other words, without a solid producer (or team of producers), there would be no movie.
For that reason, unsurprisingly, you’d find them at the very top of any film production hierarchy chart, above even the director and below only the project’s financiers.