You are describing Andrew Carnegie, a prominent figure in the American steel industry during the late 19th and early 20th centuries. Carnegie founded the Carnegie Steel Company, which became one of the largest and most profitable steel companies in the world. He is often associated with the development of the steel industry in the United States and played a significant role in the industrialization of the country.
Later in life, Carnegie became well-known for his philanthropic efforts and wrote "The Gospel of Wealth," which advocated for the wealthy to use their fortunes for the greater good of society. He donated large sums of money to various causes, including the establishment of public libraries, educational institutions, and cultural organizations. His legacy continues to influence discussions around wealth and philanthropy today.