Michael Faraday
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The experimenter who showed in 1831 that a changing magnetic field induces a current - the reciprocal of Ørsted, and the basis of generation and of every inductive coupling problem since.
It is also, directly, why twisted pair works. Twist the two conductors and the interference induced into each is roughly equal; the receiver reads the difference between them, and the difference is largely clean. A cabling standard is Faraday's law turned into a manufacturing tolerance. He had almost no formal mathematics, which did not stop him from being right, and Maxwell spent the next three decades writing his results down as equations.
Also known as: faraday, induction