Jim Simons was the founder of Renaissance Technologies, a $130 billion hedge fund. It’s a private partnership that usually invests in public markets. When I read an article about Simons passing earlier this month, I decided to read the biography I’d purchased months ago.

The Man Who Solved the Market: How Jim Simons Launched the Quant Revolution by Gregory Zuckerman details Simons’s life and journey to build RenTech. Simons generated incredible returns for his investors and created a personal fortune worth over $30 billion.

Simons was a gifted mathematician. He taught at MIT and Harvard, worked at the Institute for Defense Analyses (IDA), and cracked coded Soviet Union messages. He chaired and built the math department at Stony Brook University from scratch. He received the American Mathematical Society’s Oswald Veblen Prize in Geometry. By age 40, he was accomplished by any standards.

What motivated him to become a founder? Why did he build a hugely successful investing firm from nothing? I learned that his motivations were like those of many founders.

Outsider

In an interview for the book, Simons shared, “I’ve always felt like something of an outsider, no matter what I was doing.” “I was immersed in the mathematics,” he said, “but I never felt quite like a member of the mathematics community. I always had a foot [outside that world].”

Simons didn’t enjoy the community at Harvard. He had interests that other academics didn’t have. He’d traded soybean futures and loved the thrill of being in the markets. After teaching at MIT, he started a company in Colombia with a college buddy manufacturing vinyl flooring and PVC piping.

Simons needed a place that embraced everything he enjoyed: entrepreneurship, markets, and math. He didn’t feel comfortable in a standard box.

Control

As an academic, Jim didn’t have much money. He borrowed to invest in the Colombian manufacturing company. To pay his debts, he secretly moonlighted, teaching classes at Cambridge Junior College.

He took the job at IDA partly because it doubled his salary. Even at IDA, Simons searched for ways to make more money to pay debts. A failing attempt to launch iStar, an electronic stock trading and research firm, was one effort.

Jim realized he wasn’t in control of his destiny when IDA fired him for opposing the Vietnam War in a Newsweek article. With three children, he was rocked by the abrupt firing. He uprooted his family to Long Island, New York, and took a job at Stony Brook University.

These and other experiences reinforced his need to control his destiny. He realized that money equated to control and power. “He didn’t want people to have power over him.”

Founders are a different species. They don’t fit in standard societal boxes. To be the best version of themselves, they need environments where they feel in control. These worlds don’t exist, so they need to create them. Founders are world builders. So, in 1978, Simons created his own world, RenTech.

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