Lukas battled cancer as child. His mother has reportedly claimed that an all-organic diet eliminated his tumor.
Lukas studied environmental science and economics at Colorado College.
Lukas Walton is a grandson of Walmart founder Sam Walton; he's an investor in businesses tackling environmental and social challenges.
He inherited a fortune when his father, John Walton, died in a 2005 plane crash.
He received about one third of his father's estate; his mother, Christy Walton, got about one sixth.
He owns stakes in Walmart, First Solar and Arvest Bank, though he does not work for the companies.
Walton has donated at least $150 million to his family's namesake foundation, where he chairs the environment program committee.
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