Andrew Carnegie made significant contributions to philanthropy through initiatives focusing on education, libraries, and scientific research. His most notable endeavor was the establishment of over 2,500 public libraries in the United States, providing access to knowledge and resources for communities. Additionally, Carnegie donated substantial funds to universities and institutions, emphasizing the importance of education. His philosophy of the “Gospel of Wealth” encouraged the wealthy to give back to society, influencing modern notions of philanthropy and corporate social responsibility.