Jacob Tsimerman Wins 2026 Fields Medal for André-Oort Conjecture Proof | Quanta Magazine
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Sometimes Being First Means Seeing the End Before Anyone Else
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Previous: 2026 Fields and Abacus Medals
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The Quietest Mathematician Has Always Been Worth Listening To
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2026 Fields and Abacus Medals
Sometimes Being First Means Seeing the End Before Anyone Else
By
Kevin Hartnett
July 23, 2026
Determination and effort propelled Jacob Tsimerman to the top of the math world. But now that he’s won a Fields Medal, he worries that the field is in jeopardy.
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From an early age, Jacob Tsimerman showed great mathematical promise. “My mom told me, ‘You don’t have to be a mathematician just because you’re good at it,’” he said. “I didn’t really take her seriously.”
Caroline Gutman for Quanta Magazine
By Kevin Hartnett
Contributing Writer
July 23, 2026
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Jacob Tsimerman knows that many people see mathematics as a search for beauty. Over the course of his career, he has encountered beauty many times. But beauty is not what drives him. What he loves most is to solve hard problems, and to be the first to do so.
“In my experience, and I think many people’s experience, math is very much a goal-oriented endeavor,” he said. “The truth-and-beauty stuff is there when you’re zoomed out, but when you’re zoomed in, you just want to win.”
Tsimerman, who has slightly wild brown hair and a beard, talks fast and with visible enthusiasm. He is open and funny, but also precise — quick to pause and clarify a thought.
His fierce drive to win has fueled Tsimerman’s efforts at every stage of his career, resulting in teenage glory at the International Mathematical Olympiad, early matriculation at Princeton University, and proofs that reshaped areas of number theory and algebraic geometry, earning him a collection of top prizes.
It’s an impulse that Tsimerman has also been wary about. He knew it could consume him, especially when it came to the most entrancing honor of all — the Fields Medal, awarded every four years to the most accomplished mathematicians in the world under the age of 40 in the year the prize is given.
“I made it an explicit goal for myself not to focus on winning it,” he said. “I was like, ‘Jacob, you can’t become obsessed with it.’”
The mind trick worked, for a time. For nearly two decades, Tsimerman, 38, kept his drive focused on the math itself and became known as one of the most talented problem solvers of his generation.
But as he approached the last cycle in which he’d be eligible for the Fields Medal, he realized that his successes put him in contention. He relented and dedicated himself to the pursuit.
“Two years ago, I knew I was close, and I did let myself become obsessed,” he said.
The final push has paid off, as Tsimerman has been named one of four winners of the Fields Medal. The honor reflects a career built around borrowing techniques from one area of math and leveraging them in another to reveal surprising underlying structure.
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“In my experience, and I think many people’s experience, math is very much a goal-oriented endeavor,” Tsimerman said.
Caroline Gutman for Quanta Magazine
“He’s a brilliant problem solver. He can learn anything,” said Peter Sarnak, a professor at Princeton and the Institute for Advanced Study and Tsimerman’s graduate school adviser.
Following each milestone in his career, Tsimerman has taken stock, asking himself whether math is really how he wants to spend his life, and whether he’s in fact good enough to succeed in it. And at every previous stage the answer has come back yes.
But this time may be different. As Tsimerman contemplates what’s next with a Fields Medal around his neck, he does so as a new form of problem solver rises — one that no human may be able to beat, and which has him questioning his future in math.
Competing To Learn
Tsimerman was born in 1988 in Kazan, in southwest Russia. When he was...