What did Nikola Tesla do in his middle years?

Answer 1

When Tesla was 24 years old , he came up with the idea of a revolutionary method of generating electricity using alternating current. He called it the polyphase system. After that he was cheated by Edison so he left him. George Westinghouse hired the 30 year old Tesla to work in his new laboratory in Pittsburgh.

Westinghouse then purchased the patent rights for Tesla's polyphase system for $1,000,000. A few years later, Tesla used much of the money he received from selling his patent to start the Tesla Electric Company in New York.