S. Robson Walton
Samuel Robson "Rob" Walton (born October 28, 1944) is an American businessman and is the eldest son of Helen Walton and Sam Walton, founder of Walmart, the world's largest retailer. He is Chairman of the company. In October 2012, Walton was listed as the 11th richest person in the world. His net worth was $34.2 billion as of March 3, 2014 .