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10. Louis Bacon—Robins Island
While Louis Bacon is certainly not a household name, his net worth surely holds its own on Wall Street. This American investor and hedge fund manager is worth an estimated $1.7 billion. In 1993, Bacon purchased Robins Island, off the coast of Long Island, for $11 million. Rather than commercialize the property as you might expect a banker to do, he declared it to be a project for conversation. He seeks to maintain its coasts, waterways, and natural landscape.