Who was the king of steel who believed that rich people should not waste fortunes on themselves?

The "king of steel" refers to Andrew Carnegie, a Scottish-American industrialist who led the expansion of the American steel industry in the late 19th century. Carnegie was a proponent of the "Gospel of Wealth," which argued that the wealthy had a moral obligation to distribute their surplus wealth for the greater good of society, rather than indulging in personal luxuries. He believed in using one's fortune to support education, libraries, and other philanthropic endeavors.