The Mellons – $11.5B
The Mellons have traced their roots to Pittsburgh, Pennsylvania. In 1869, the Mellon Bank was founded by the family. This was the beginning of their wealth, although it only truly skyrocketed after their investment in Gulf Oil, now known as Chevron-Texaco. They also invested in New York Shipbuilding, Alcoa, The Pittsburgh Tribune-Review, and Carborundum Corporation. The family is known for its philanthropy as well. The Mellons actually have Scottish-Irish roots and arrived in the country when Thomas Mellon, the original patriarch, immigrated from Ireland. Do you think he knew how well he would end up doing for himself in the beginning?

The Mellons – $11.5B