Nikola Tesla
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Nikola Tesla (July 10, 1856 – c. January 7, 1943; Serbian Cyrillic: Никола Тесла) was a Serbian inventor, physicist, mechanical engineer, and electrical engineer. He was born in Smiljan, in the part of former Austria-Hungary that is now the Republic of Croatia. He later became an American citizen.
He invented an early form of the radio. His main discoveries were in the fields of magnetism and electricity. He is best known for his contributions that led to the development of Alternating current, following the "Current War" against direct current. The advantage that popularised alternating current is that less of it is lost when the current is transmitted over long distances.
The SI unit measuring magnetic flux density or magnetic induction (commonly known as the magnetic field 
), the tesla, was named in his honour (at the Conférence Générale des Poids et Mesures, Paris, 1960). He also invented several forms of oscillators.
Although Tesla was very famous for his discoveries, he died a poor man. What is more, he did not get credit for inventing the radio until after he died. Most people regarded Tesla as a mad scientist. Tesla got his first job in Budapest, working at a telephone company. Even in his early life, he was inventing things. He invented a loudspeaker for telephones. Tesla also had mental problems starting from an early age, suffering from obsessive-compulsive disorder.
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