It takes a lot of people to make a film, but only a handful of them get much credit. Director. Cinematographer. Editor, if he’s lucky. The end credits go on and on, but few people understand what all of these people even do. For example: the producer. It’s a nebulous, seemingly catchall term for someone who does the nitty-gritty work of putting a production together. But while the title might be ambiguous, it requires a very specific type of person. A mix of optimist and realist. A relentless self-starter. A serial entrepreneur. A person like Jens Jacob.