Perhaps it would be just as "interesting" to consider the stereotype of the biomedical technician or engineer.
As I may have mentioned before, for reasons* that now escape me it was once de rigueur
for biomeds in certain parts of the world to sport beards (or "barbs" as they were sometimes called).
Specs are (or, to be more specific, used to be) optional. "Shades" being much preferred.
I'm not so sure about brown hair, though. Grey, maybe (or in some cases, none).
Oh, ... and rounded shoulders from all that being hunched over the "kit", screwdriver poised and ready to strike.
* It may have been a desire to blend in with the natives.