Nikola Tesla

At the first meeting in Edison's laboratory, Tesla was already very impressed with him.

An excerpt from the article 35 facts about Nikola Tesla

Thanks to excellent recommendations from Europe, he was hired at Edison's lab, and although he was not initially satisfied with his work, he quickly demonstrated his skills and was promoted. Edison also commissioned him to bring about improvements in the efficiency of generating electricity in Thomas A.'s power plants. Edison. He offered him the sum of $50.000 if the efficiency of the power plants increased by 50%.