James John Davis (October 27, 1873 - November 22, 1947) was a Wales-born American businessman, author and Republican Party politician in Pittsburgh, Pennsylvania. He served as U. S. Secretary of Labor and represented Pennsylvania in the United States Senate. He was also known by the nicknames of the "Iron Puddler" and "Puddler Jim." In 1922, Davis published his autobiography, The Iron Puddler, which was ghostwritten by C. L. Edson, who had previously worked for Davis as an editor of a Loyal Order of Moose publication. He served as United States Secretary of Labor from 1921 to 1930 under Presidents Warren G. Harding, Calvin Coolidge, and Herbert Hoover. He is one of only three Cabinet officers in U. S. history to hold the same post under three consecutive Presidents.