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Astor got his start as a fur trader after hearing a fellow traveler talk about the profession on his voyage to America. A penniless German immigrant, his business endeavors were helped when he married his wife, who came from a wealthy family.
But his real money came from investing in Manhattan real estate. By the time his son ran the family businesses, the Astors owned over 700 Manhattan properties.
The Astor family fortune was one of the most enduring of the top 20, thanks in part to the elder Astor's insistence that half his trust be set to skip a generation, preventing its squander by spendthrift heirs.