Andrew Carnegie is one of the richest guys in the world .
He founded the 1st steel plants that were used to the Bessemer process
He also preached a ¨ gospel of wealth¨
John Davison Rockefeller Sr. was an American oil industry business magnate, industrialist, and philanthropist. He is widely considered the wealthiest American of all time, and the richest person in modern history.
Rockefeller retired from day-to-day business operations of Standard Oil in the mid-1890s.
Rockefeller donated more than half a billion dollars to various educational, religious and scientific causes. Among his activities, he funded the Rockefeller Institute for Medical Research (now Rockefeller University).