George E. Clymer, printing press inventor and manufacturer, from Philadelphia, Pennsylvania, was an American engineer and all around inventor. Clymer, in his earlier vocational years, was something of a civil engineer and as an inventor became noted for his improvements and developments in early nineteenth century printing presses, and ultimately developed his own distinctive printing press, which soon became widely known as the Columbian Printing Press, which were often favorably received by printers in America, England and parts of Europe. After relocating to England because of better market conditions, Clymer subsequently became one of the principal developers and suppliers of printing presses in Europe in the early nineteenth century. The innovative designs he incorporated into his printing presses were put to use in the manufacturing of other printing presses years after his death.

The Columbian press is a type of hand-operated printing press invented in the United States by George Clymer, around 1813. Made from cast iron, it was a very successful design and many thousands were made by him and by others during the 19th century. Columbians continued to be made as late as the early-20th century, 90 years after their introduction. Despite their age, many are still used for printing, especially by artists who make prints using traditional methods.