18 Rob Walton
Samuel Robson “Rob” Walton is the oldest son of Walmart founders Helen and Sam Walton. He started working at the superstore empire back in 1969 and served as chairman from 1992 to 2015.
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Walton retired as chairman in June 2015 and was replaced by his son-in-law, Greg Penner. He still sits on Walmart’s board.
However, he is ranked as the 16th-richest men in the world, with an estimated net worth of $44.3 billion.
