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Rudolf Diesel (18 March, 1858–29 September, 1913) who revolutionized the field of automobile by manufacturing the diesel engine. Educated at Munich polytechnic, he started his career as a refrigerator engineer. Persuaded by his love for engines, he designed many engines. In 1894, he filed patent application for the internal combustion engine, later to be named as the diesel engine. The peculiarity of this engine was that to ignite the fuel, a spark was not needed. The operation of his engine started in 1897.
Though the main achievement of Rudolf Diesel is the  invention of the internal combustion engine yet he was also perceived as a social theorist and a reputable thermal engineer. The diesel engine he invented had the theoretical efficiency of 75% as against 10% of the steam engine. In addition to the automobile industry, the diesel engine played a big role in developing power plants, mines, factories, oil fields and other areas.