Cyrus Hall McCormick (February 15, 1809 – May 13, 1884) was an American inventor and businessman who founded the McCormick Harvesting Machine Company, which became part of the International Harvester Company in 1902. Originally from the Blue Ridge Mountains of Virginia, he and many members of the McCormick family became prominent residents of Chicago.
McCormick always claimed credit as the single inventor of the mechanical reaper. He was, however, one of several designing engineers who produced working models in the 1830s. His efforts built on more than two decades of work by his father Robert McCormick Jr., with the aid of Jo Anderson, an enslaved African-American man held by the family. He also successfully developed a modern company, with manufacturing, marketing, and a sales force to market his products.