William Gregg. University of South Carolina Aiken, Gregg-Graniteville Library. (1800-1867) William Gregg was the founder of the Graniteville Company, an early cotton mill in Aiken County. Resources Knowitall - William Gregg South Carolina Encyclopedia - William Gregg South Carolina Encyclopedia - Graniteville Company South Carolina Hall of Fame - William Gregg Discus Resources Gale in Context: Biography History Reference Center Credo Reference