Holy smokes, I thought I was the only guy alive who knew who Oliver Heaviside was! My old man was an EE who got his degree in the 50s and when I went through my own EE education in the late 80s I tried to use his old books as references. However they were really different. Lots of "operational calculus" which was what they called using transforms to solve diff EQs algebraicly (i.e. as we do with Laplace transforms) but the transforms themselves were different. One was the "Heaviside transform". It wasn't the same as a Laplace transform though. I think he pioneered the field of linear systems analysis as EEs today know it, using transforms and transfer functions to solve complex diff EQs easily and indeed, he gets no credit because for fifty years mathematicians rolled their eyes and considered that "not real math".
One of his books had some biographical sketches of some of the forgotten men who basically invented electrical engineering including Heaviside and Steinmetz. Brilliant guys who made our modern world possible, but nobody knows who they are.
Steinmetz. Another of my favorites. He was a deformed dwarf who the immigration authorities didn’t want to let in to the country. George Westinghouse, picking up someone else overheard things and offered him a job and he was allowed in.