I am an engineer by education. I have both bachelor's and masters degrees in mechanical engineering from accredited US universities.
I am not a Professional Engineer; i.e., I cannot stamp drawings.
I know acoustics, engineering physics, math. I know gain structure. I know what kind of microphone helps augment a certain tonal characteristic, or perhaps reject a sound I want rejected. I know where to put microphones.
I read music, and can play a whole bunch of instruments at a decent level and a couple better than that. I read people, too. I think I run sessions efficiently and help create environments with good vibe and low stress.
I'm often wrong.
All that having been said, I couldn't fix a dead amp if you spotted me the schematic, a soldering tech, and some divine intervention.
Do I count?