Parker was a telegraphy instructor in Janesville, Wisconsin, and had a sideline repairing and selling fountain pens. Dismayed by the unreliability of the pens, he experimented with ways to prevent ink leaks. In 1888, Parker founded the Parker Pen Company. The next year he received his first fountain pen patent. By 1908, his factory on Main Street in Janesville was reportedly the largest pen manufacturing facility in the world. Parker eventually became one of the world's premier pen brands, and one of the first brands with a global presence. George S. Parker High School in Janesville is his namesake. Parker graduated from Upper Iowa University in Fayette, Iowa.

The Parker Jointless "Lucky Curve" is a range of fountain pens released by the Parker Pen Company in late 1897. The pen used the Lucky Curve ink supply system, designed to draw ink even when the pen was not in use, which was invented and patented by George Safford Parker in 1894. The pen was named "Jointless" because of its one-piece ink barrel, designed to prevent leakage, an innovation at the time – though the design made the refilling process messy. The pen was Parker's first to be advertised outside the United States.

The American government purchased the pens in large quantities and a Parker Jointless was one of the pens used to sign the Spanish–American Treaty of Paris in 1898.

According to wikipedia