Mikhail Dolivo-Dobrovolsky

Mikhail Osipovich Dolivo-Dobrovolsky (Russian: Михаи́л О́сипович Доли́во-Доброво́льский; German: Michail von Dolivo-Dobrowolsky or Michail Ossipowitsch Doliwo-Dobrowolski; Polish: Michał Doliwo-Dobrowolski; 2 January [O.S. 21 December 1861] 1862 – 15 November [O.S. 3 November] 1919) was a Russian-born engineer, electrician, and inventor of Polish-Russian origins, active in the German Empire and also in Switzerland. After studying in Germany and while working in Berlin for Allgemeine Elektricitäts-Gesellschaft (AEG), he became one of the founders (the others were Nikola Tesla, Galileo Ferraris and Jonas Wenström) of polyphase electrical systems, developing the three-phase electrical generator and a three-phase electrical motor (1888) and studying star and delta connections.

Source: Wikipedia — Mikhail Dolivo-Dobrovolsky (CC BY-SA 4.0)