Best Boy Grip:
 
Assistant to the Key Grip. Best Boy takes care of the equipment, brings on extra manpower, orders, supplies, etc.
 

 
Dolly Grip:
 
Person who handles the dollies and cranes. A dolly is a platform on which a camera is placed. It has a hydraulic arm that lowers and raises, and it has wheels.
 

 
Prop Master:
 
Person responsible for preparing the prop breakdown and budget for selecting, positioning, and maintaining all props. Props are items that are carried or handled by the Actors, including food and drink, office or household supplies, money, weapons, tools, toys, games, and so on.
 

 
Costume Designer:
 
Person responsible for researching and designing the costumes and accompanying accessories for the actors & actresses and oversees the making fitting, acquisition, and rental of all wardrobe items.
 

 
Key Costumer:
 
Individual who is responsible to the costume designer for the selection, acquisition, rental, and care of all wardrobe items. This person also prepares a costume breakdown and, in consultation with the costume designer and production manager a wardrobe budget.
 

 
Key Make-Up Artist:
 
Individual in charge with the application of makeup on the actors, actresses, and extras. The Make-up Artist is also responsible for preparing a makeup schedule and for supervising and coordinating with other members of the makeup department, including assistants, body makeup artists, special effects makeup and hair stylists.
 

 
Key Hair Stylist:
 
Styles and it required, cuts, colors, and washes the hair and wigs of all actors and actresses.
 

 
Film / TV Job Descriptions
 
Courtesy of Get Into Hollywood.com
 

 
Literary Agent:
 
Is the people responsible for helping creative talent obtain employment. This talent usually includes: actors, writers, directors & producers. They pitch their clients to show runners and studio executives in hopes of securing them a job. They also negotiate contracts and nurture the career of their clientele.
 

 
Executive Producer:
 
This person is hired by a studio to help manage every aspect of a television show. The executive producer is the highest level of producer on a given show. This person is usually a writer, but can also be a non-writing producer. In television, this individual is often the series creator. Essentially all of the producers, directors and actors answer to the executive producer.
 

 
Show Runner:
 
A writing executive producer who is in charge of the creative direction of a show. This person hires the writing team, signs off on all aspects of the storylines and scripts, and signs off all decisions regarding the look of the show; including wardrobe, set dressing, props and art direction.
 

 
Teleplay Writer:
 
A writer who is given an outline of an episode and is required to turn that outline into a script. They also create characters, dialogue, dramatic situations, and written aspects of a TV series.
 

 
Director:
 
The director is the head of the production unit and is responsible for directing the actors and for translating the teleplay into cinematic images in accordance with his/her vision. Not only must they establish a good relationship with their actors, they must also understand all technical issues regarding television.
 

 
Producer:
 
A producer is hired by both the Executive Producer and the Studio. This person is the liaison between these two entities. They are responsible for all financial aspects of the television show. They are also very instrumental in hiring and managing all below-the-line crew members. It is their responsibility for keeping the show on budget.
 

 
Associate Producer/Production:
 
The Associate Producer helps the producer with all "line" aspects of the production. They deal with scheduling the production, hiring crew and ordering all equipment for the show.
 

 
Associate Producer/Post:
 
This person is also known as the "Post" producer. They are responsible for all aspects of post production, including picture editing, music scoring, title session, final color correction, all audio editing and final audio mixing.
 

 
Production Coordinator:
 
This person is responsible for setting up and organizing the production and writer offices; acts as liaison between the production office and the set, and prioritizing information for expeditious handling the producer and production manager and/or associate producer.