S Robson Walton net worth: S. Robson Walton is an heir to the Wal-Mart fortune with an estimated net worth of $32 billion dollars. S. Robson Walton is the eldest son of Sam Walton, the founder of the world's largest retailer Wal-Mart. S. Robson Walton is the Chairman of the worldwide Wal-Mart company, assuming the position after his father's death in April 1992. a bachelor of science degree in business administration from The College of Wooster, and received a juris doctor degree from the Columbia University School of Law in New York City in 1969. Rob Walton was a member of the law firm representing Wal-Mart until taking over the Chairmanship of the worldwide Wal-Mart company. Wal-Mart is the world's largest retailer, with 7,300 stores employing 2 million workers and serving 200 million customers.