Mechanical Engineering

any of the early NASA engineers

https://history.nasa.gov/SP-4104.pdf

Tommy Flowers

"Q" from James Bond, "Whistler" from Blade and Montgomery Scott "Scotty" from Star Trek.

My old mentor. He was the Senior Engineer at my first real 'job' and an amazing engineer who could build anything he designed. Mechanical design, CAD, machining, electrical, PLC programming... the guy could do most anything.

Beyond his expertise, he was a really good listener and never let his ego get in the way of learning from others. Probably one of the best team builders I've ever worked with, and those seem to be in really short supply these days.