Thomas Carnegie was an American industrialist born on April 9, 1851, in Pennsylvania. He was the younger brother of the famous steel magnate Andrew Carnegie. Together, they played significant roles in the development of the Carnegie Steel Company, which became one of the largest and most profitable steel companies in the United States during the late 19th century. In addition to his work in the steel industry, Thomas Carnegie was involved in various philanthropic efforts, similar to his brother. He contributed to the establishment of several institutions and supported educational initiatives, reflecting the Carnegie family's commitment to social improvement and community development.