"Nikola Tesla was an inventor, physicist, mechanical engineer, and electrical engineer. He is often regarded as one of the greatest engineers of the 19th century and 20th century and he was a pioneer of electromechanics. He was of Serb descent and, while conducting his work in the United States, became an American citizen in 1891.
His patents and theoretical work still form the basis of modern alternating current electric power (AC) systems including the polyphase power distribution system, with which he helped usher in the Second Industrial Revolution. After his demonstration of wireless communication in 1893 and winning the 'War of Currents', he was widely respected."
Tesla and Highvoltage - tribe.net