Long before he became known as the most successful trader in history, he was solving problems most people can't even understand.
He chaired a university mathematics department. Before that, he worked as a codebreaker for a U.S. defense think tank during the Cold War, using pure mathematics to crack Soviet codes — work he was eventually let go from after publicly criticizing the Vietnam War. Along the way, he co-developed a piece of geometry so fundamental it would later turn up in string theory and even condensed matter physics. This was not a man dabbling in numbers. This was one of the sharpest pure mathematicians of his generation.
So why did he walk away from academia to start a hedge fund?
He had a hunch that most of Wall Street was getting it backwards. Traders were relying on instinct, narratives, and "expert" judgment about companies and economies. He believed markets — chaotic as they looked on the surface — might actually contain hidden statistical structure, the same way encrypted signals look like noise until you find the pattern underneath.
In 1978, he left mathematics to test that theory. It took years of failure before it worked. But when it did, it became one of the most secretive and successful hedge funds ever built — and the firm didn't hire finance people. It hired physicists, codebreakers, and mathematicians. People who knew how to find a signal in noise, not people who could explain why a stock "should" go up.
In his own words: "We don't hire people from business schools. We hire people who have done good science."
That decision — trusting the data over the story — is where this series begins.
His name is Jim Simons — James Harris Simons.
Next: how a fund with no economists on staff built the best track record
in trading history.