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Jason "Jay" Gould was an American railroad developer. He was one of the richest men of his time. He was portrayed as one of the most mean, ruthless Robber Barron's around. He was born May 27, 1836. It was estimated that he was worth around 71 billion dollars.
Sources:https://en.wikipedia.org/wiki/Jay_Gould

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J.P. Morgan was an American banker who dominated corporate finance during the late 19th century. He is the founder of J.P. Morgan Chase, which is a well known bank. He was also a part of the merger of General Electric. He was born on April 7, 1837. He was worth around 41.5 billion dollars.
Sources:https://en.wikipedia.org/wiki/J._P._Morgan

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John D. Rockefeller was an American oil company manager. He also was a philanthropist for the companies he ran. He was born on July 8. 1839. Today, he is still considered one of the wealthiest Americans ever. He has a university in New York named after him.
Sources:http://www.history.com/topics/john-d-rockefeller

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Jay Cooke was an American financier. He was on the side of the Union during the American civil war. He was born on August 10, 1821. He had a company called Jay Cooke and Company. Today, he has an entire state park named after him in Ohio. Bonus sentence: He has the worlds coolest first name.
Sources: http://www.american-rails.com/cooke.html

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James J. Hill was a Canadian-American railroad executive. He worked with the Great Northern Railway. He had eight kids and only one was a boy. He was born on September 16, 1838. He wrote the book Highways of Progress, which was a scholars choice edition.
Sources:https://www.biography.com/people/james-j-hill-38025