Question

Who was John D. Rockefeller?

Answer 1

This is just an addition to the answer above (or below). He and Andrew Carnegie were great business partners and the Rockefeller family still stands as one of the most powerful families in the world.

Answer 2

Someone important...

hahaha, sorry
John D. Rockefeller was an American business magnate and philanthropist in the oil industry. He is considered to be the wealthiest American, and the richest in modern history.

P.S. a simple google search would give you the answer ;)