George Safford Parker, the founder, had previously been a sales agent for the John Holland Gold Pen Company. He received his first fountain pen related patent in 1889. In 1894 Parker received a patent on his "Lucky Curve" fountain pen feed, which was claimed to draw excess ink back into the pen barrel when the pen was not in use.

George Safford Parker – Founder of Parker Pen Company 

The company's first successful pen, released in 1899, was the Parker Jointless. The Lucky Curve feed was used in various forms until 1928.

From the 1920s to the 1960s, before the development of the ballpoint pen, Parker was either number one or number two in worldwide writing instrument sales. In 1931 Parker created Quink (quick drying ink), which eliminated the need for blotting.

In 1941 the company developed the most widely used model of fountain pen in history (over $400 million worth of sales in its 30-year history), the Parker 51. Manufacturing facilities were set up over the years in Canada, United Kingdom, Denmark, France, Mexico, USA, Pakistan, India, Germany (Osmia-Parker), Brazil and Argentina.

According to wikipedia