WHO ARE THOSE GUYS?
The title on this post is stolen fair and square from Butch Cassidy, spoken about the posse that just keeps coming. This post is about who those guys in the movie credits are. This topic was suggested by one of my fans, and I appreciate and now act on that suggestion! I’m going to skip some fairly obvious ones, like Caterer and Accountant. But some of the less obvious titles follow.
Director- the main guy who tells everyone what to do and when. Think Cecil B. DeMille or Martin Scorcese. 
Assistant Director- a title that covers a multitude of jobs, some big, some not. A lot of big-time directors started this way. These guys are assigned tasks during shooting, ranging from fetching coffee to directing scenes.
Producer- Think money! Want to get your name on the credits as a producer? Just write a big check. 
Executive Producer- Probably wrote the biggest check. Also may be the person who came up with the idea and pitched it to the studios. Often it will be the biggest star in the movie, who has always wanted to do this movie and now has enough money and clout to get it done.
Second Unit- Not exactly the same as second team in sports. When movies are shot in more than one place, eg. Hollywood and Mexico, the second unit folks take over the second spot. All titles apply, they just don’t get paid as much.
Gaffer- I love this one! He (or she) is the head electrician on a set. He supervises all the lighting and often designs it. The term comes from the early days of the movies and referred to the guy who moved the overhead equipment to control the lighting, called a gaff.
Best Boy- Another popular favorite. Assistant to the gaffer (see above) or the grip (see below). The best boy is often a girl, sometimes called such, sometimes not. 
Key Grip- The person in charge of all the equipment including cameras. Reports to the director of photography. 
Tutors- Actually, just what you think. All the child actors and children of production members on the set still have to go to school. And these folks teach them.
Stunt Director- Decides when stunts are needed, and hires the folks to do them. Most big name actors don’t do their own stunts- stunt men or women who look enough like the big guys to get by are hired.  By the way, Tom Cruise famously does his own stunts!
Loader- Physically loads the film into the camera. Or the CD. Nowadays, the majority of movies are shot in digital format, not film. But many directors still prefer film.
SFX- Special effects. Anything from parting the Red Sea to avatars. Indispensable to today’s big action films. These days done almost entirely by computer.
Rigger- in charge of ropes, cables, wires, scaffolding, etc., when needed for a scene. In the theater in charge of “flying” actors (eg. Peter Pan) but no longer needed as such for films.
Casting- In coordination with producers and directors, decides what actors to hire for what purposes, and contracts with them and their agents. When this appears in the end credits the cast member list usually follows.
Production Companies- Won’t usually be in the credits, but at the first of a movie. 
They supply the bucks and sometimes the people. Think Working Title, Canal, Dreamworks, Pixar.
This article is suitable for all audiences who can read.