Herbert Clark Hoover (August 10, 1874 – October 20, 1964) was the 31st president of the United States from 1929 to 1933. He was a world-famous mining engineer and humanitarian administrator. As a United States Commerce Secretary in the 1920s under Presidents Warren G. Harding and Calvin Coolidge, he promoted economic modernization. Soon after he became president, the Great Depression started. Many people blamed Hoover for not doing enough to help people during that time.