Nikola Tesla

Nikola Tesla held over 300 patents and invented the technology that powers modern civilization — alternating current, the induction motor, radio transmission, remote control, fluorescent lighting, and the theoretical basis for radar, X-rays, and wireless communication. Every time you plug something into a wall outlet, you're using Tesla's invention. The value he created is incalculable — trillions of dollars of economic activity across more than a century. His personal net worth at death: approximately zero.

The pivotal financial moment came in 1897 when Tesla tore up his royalty contract with Westinghouse. The deal would have paid him $2.50 per horsepower of AC electricity sold — a royalty that, had he kept it, would have made him the first billionaire in history several times over. Tesla surrendered the contract because Westinghouse was struggling financially and Tesla valued the friendship. He traded what would be worth hundreds of billions today for loyalty to a business partner. It is arguably the most expensive act of generosity in human history.

Tesla spent his final decades living in a series of New York hotels, each one cheaper than the last as his money dwindled. He fed pigeons in Bryant Park daily and claimed to have fallen in love with a particular white pigeon. When he died alone in Room 3327 of the New Yorker Hotel on January 7, 1943, his total assets were less than his hotel debt. The FBI seized his papers, fearing they contained weapons technology. Today, a company named after him is worth over $500 billion. Elon Musk is worth more than $200 billion from that company. Tesla himself saw none of it — not a cent for his name, not a dollar for the future he invented.