What most budding fader jockeys don't get - and it doesn't just have to be audio engineer, it could be any of the many engineering fields - is that "engineer" is a verb before it is a noun.
Glen, you are right that engineers generally go through an intern or training phase before being licensed as a "professional engineer". That latter term, at least, has a specific, legal meaning and a person has to demonstrate certain knowledge and competencies before we set them loose on society to do things like design bridges people will drive over or buildings they will work or do business in. Along the way, one first becomes an "intern" or "engineer in training", which is also a defined term.
I stole the following from Wiki, though I recall drafting some state law on this subject back in the 90s so I pretty much knew the score. The emphasis is mine.
"The term Professional Engineer and the actual practice of professional engineering is legally defined and protected by a government body. In some jurisdictions only registered or licensed Professional Engineers are permitted to use the title, or to practice Professional Engineering.
The earmark that distinguishes a licensed/registered Professional Engineer is the authority to sign and seal or "stamp" engineering documents (reports, drawings, and calculations) for a study, estimate, design or analysis, thus taking legal responsibility for it."
"In the United States, registration or licensure of Professional Engineers is performed by the individual states. Each registration or license is valid only in the state in which it is granted. Many Professional Engineers maintain licenses in several states for this reason, and comity between states can make it easy to obtain a license in one state based on licensure in another state without going through the full application process. In the US, each state licenses or registers engineers.
The licensing procedure varies but the general process is:
1. Graduate with a degree from an accredited four-year university program in engineering.
2. Complete a standard Fundamentals of Engineering (FE) written examination, which tests applicants on breadth of understanding of basic engineering principles, and optionally some elements of an engineering specialty.
Completion of the first two steps typically qualifies for certification in the U.S. as an Engineer-In-Training (EIT), sometimes also called an Engineer Intern (EI).
3. Accumulate a certain amount of engineering experience under the supervision of a P.E. In most states the requirement is four years, but in others the requirement is lower.
4. Complete a written Principles and Practice in Engineering ('PE') examination, testing the applicant's knowledge and skills in a chosen engineering discipline (mechanical, electrical, civil, for example), as well as engineering ethics."
Cheers,
Otto