A Scottish-American businessman, a major and widely respected philanthropist, and the founder of the Carnegie Steel Company which later became U.S. Steel. He is known for having built one of the most powerful and influential corporations in United States history, and, later in his life, giving away most of his riches to fund the establishment of many libraries, schools, and universities worldwide. Carnegie first invested in railroads, railroad sleeping cars, as well as bridges and oil derricks. But steel was where he found his fortune. His book, The Gospel of Wealth, argued that the wealthy had an obligation to give something back to society.