Charles Proteus Steinmetz
German mathematician and electrical engineer Charles Proteus Steinmetz (April 9, 1865 – October 26, 1923; born Carl August Rudolph Steinmetz) made radical and important contributions to the sciences, including the law of hysteresis, his symbolic method of calculating alternating-current, and his theory of electrical transients. As a wise-man once said: "To study Tesla without knowing Steinmetz is indeed a foolish thing."
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