Andrew Carnegie was a Scottish-American industrialist, entrepreneur, author, and philanthropist best known for building the American steel industry and becoming one of the wealthiest figures of the Gilded Age. Founder of Carnegie Steel Company, Carnegie played a transformative role in U.S. industrialization, business leadership, and economic growth. He is also widely recognized for his influential writings on wealth, success, and philanthropy, including The Gospel of Wealth, which advocated using one's personal fortune to advance education, libraries, and public institutions. A major benefactor of universities, museums, and thousands of public libraries, Andrew Carnegie remains a key figure in American business history, capitalism, philanthropy, leadership studies, and self-improvement literature.