Then and now:
Before the Apple desktops, Adobe's Post Script, and other page layout application were made available everything in the printing and design work was needed to be done by specialized craftspeople. All these functions back then were divided between different trades. Designers were designated to their functions as well as trade shops and printers

Many of these specialized jobs do not exist any longer because they can now be done by desktop users. Page layout programs replaced a lot of functions that were being done in trade shops, things that needed to be manually done can now be done on a computer. Along with the change of technology, redistribution of responsibilities was necessary. The redistribution of labor began to look a lot more like the table below.
Job titles and salaries:
Sales Rep/customer service:
CSR's interact with customers to provide information in response to inquiries about certain products or services. CSR's are knowledgeable in the services and products their company provides in order to handle costumer questions or complaints, and perhaps also to explain how things work.
Salary can range from $19,000 to $42,000 a year.
Estimator:
Estimators are responsible for estimating the time, labor, paper, ink, and other materials that will be required to complete a printing job.
Salary can range from $32,000 to $62,000 a year.
Preflight technician:
Loading customer prepared files for output and checking them for any errors, completeness, and potential problems. Identify missing components and communicate them to CSR, and personnel to work out any problems with the job.
Salary can range from $20,000 to $50,000 a year depending on area and experience.
Prepress operator :
Prepress operators prepare items for print. They layout text and artwork and correct any formatting errors so that the publication looks like the designer intended. Prepress operators may prepare the metal plates to transfer the words and images to paper.
Salary can range from $28,000 to $57,000 a year
Imposition: Placing individual pages of a multipage document in the correct position for final printing.
RIP (Raster Image Processor): A specialized computer that uses a combination of proprietary software and hardware to translate PostScript or PDF input to a very high-resolution bitmap image that drives the marking engine of an ouptut device, such as an imagesetter, platesetter, or a desktop printer.
Trapping: To create overlapping areas of common color in order to minimize gaps during slight misregistration on press. This is usually performed at the RIP stage however you can create traps in applications manually as well.
Die Cutting: Using pressure and shaped metal dies in order to cut a printed piece in an interesting shape. This is done by the printer, or by specialty companies that are subcontracted by the printer.
All images were taken from Real World Print Productions by Claudia McCue