S. Robson Walton


Wal-Mart Stores Inc.


Age: 67


S. Robson Walton

Rob Walton joined Wal-Mart in 1969 and has been senior vice president, secretary and general counsel and vice chairman. He was named chairman of the board of Wal-Mart Stores Inc. in 1992, days after his father, founder Sam Walton, died.

He also is a trustee at Wooster College in Ohio. In March 2011, Forbes estimated Rob Walton's net worth to be $21 billion, placing him No. 22 on the list of the world's billionaires.