Inventors of a fountain pen and ballpoint pen saw the same fountain pen and found it flawed. First, one didn’t like that it leaked while the second didn’t like that it needed too much time to dry when it’s on the paper. And they made it better for all of us.
If you want to thank someone because you don’t have messy fingers and paper when you write with your fountain pen - thank Lewis Edson Waterman who improved a fountain pen and made it a useful tool.
If you are reading this, there is a high probability that you have at least one ballpoint pen in radius of 2 meters form yourself. And who deserves credit for that? László Bíró! (and his brother... and probably some more people...)
George Parker was an American industrialist and inventor. He created the Parker pen brand and Pen Parker Company. Pen Parker Company is one of the largest writing instruments company in the world and the first one that went global.