University of Toronto professor Jacob Tsimerman has been awarded the Fields Medal, becoming the first scholar based at a Canadian institution to receive the prestigious honor.
The announcement was made on July 23, 2026, at the International Congress of Mathematicians in Philadelphia.
Often referred to as the Nobel Prize of mathematics, the Fields Medal is awarded every four years to mathematicians under the age of 40.
Tsimerman shares the 2026 prize with Yu Deng, John Pardon, and Hong Wang. Each recipient receives a $15,000 award.
A Breakthrough Proof of the André-Oort Conjecture
The 38-year-old mathematician was recognized primarily for his groundbreaking proof of the André-Oort conjecture, a complex arithmetic geometry problem that had remained unsolved for nearly four decades.
His recent research has also resolved the Griffiths conjecture and expanded functional transcendence theory.
Reflecting on his achievement, Tsimerman emphasized the collaborative nature of mathematical discoveries.
“It’s an incredible honour to win this award – not just for me, but for all my collaborators without whom this truly would not be possible,” said Tsimerman, a U of T alumnus.
“Math is such a team sport that it becomes impossible to disentangle who contributed what on projects.
I'm lucky to have many of my collaborators as close friends, which helps work feel fun and playful.”
Early Passion for Puzzles
Tsimerman’s fascination with mathematical puzzles began in early childhood.
He went on to win two gold medals at the International Mathematical Olympiad, including a perfect score in 2004.
“By the time I was three, I was enjoying math puzzles,” he said.
“My grandfather was a physicist and my mother taught math, so I had a lot of support and resources growing up, along with plenty of puzzles to solve.
And that’s what mathematics is, basically: puzzles.”
Addressing his work process, Tsimerman noted that solutions often come after long periods of study.
“I might be at a bar taking a shot and something will occur to me — but it's not because I'm Matt Damon in Good Will Hunting,” he said.
“It's because I've been thinking about it for months or years and that just happened to be when I figured it out.”
He also jokingly referenced superhero powers when asked about his problem-solving approach.
“I wish I had Spider-Man's powers,” he said.
Highlighting the necessity of partnership in mathematical research, Tsimerman shared his experience with working independently.
“When I work alone, I start to suspect I’m crazy or that everything I’m doing is wrong,” he said.
Colleagues and academic leaders praised Tsimerman's contributions to number theory and the global academic standing of the institution.
“The methods used to approach it cover, I would say, the whole of mathematics,” said Andrei Yafaev, a professor at University College London.
Korean research institutions also praised his recent work on Shimura varieties, pointing out its broad impact across the discipline.
“While his work on Shimura varieties is the most well-known, he has produced results in other fields that are effectively worthy of a Fields Medal on their own,” said Kim Wan-soo, a professor at KAIST.
University leaders noted that Tsimerman’s achievement underscores the institution’s long-standing leadership in international mathematical research.
“The Fields Medal recognizes Professor Tsimerman’s tremendous accomplishments and his stature as one of the world’s most promising leaders in mathematical research,” said Melanie Woodin, President of the University of Toronto.
“On behalf of the entire University of Toronto, I want to offer Jacob my heartfelt congratulations. This is a proud and historic moment for all of us.”
Former departmental leaders highlighted his unique ability to bridge diverse fields of mathematics through innovative research methods.
“Jacob's Fields Medal honours his transformative research, which has built connections between disparate fields to capture mathematical structures that had eluded top researchers for decades,” said Robert Jerrard, former chair of U of T’s math department.
“It confirms Jacob's stature as one of the foremost number theorists of his generation.
It also marks a proud moment for our department, where he developed much of his groundbreaking research.”
Faculty members who knew Tsimerman throughout his career noted his enthusiasm for collaborating with students and peers.
“I’ve known Jacob as a student and a colleague and, obviously, he is brilliant,” said Mary Pugh, chair of U of T’s department of mathematics.
“His love of mathematics is absolutely infectious.
He's someone who can be routinely found in the lounge at a blackboard puzzling over something with a handful of students, delighted to think together with them.”
The university administration expressed confidence in his future academic trajectory.
“It is a thrill to congratulate Professor Tsimerman on receiving this esteemed honour,” said Stephen Wright, dean of U of T’s Faculty of Arts & Science.
“The Fields Medal is bestowed in part for future achievements; this is completely consistent with our confidence that Jacob will continue to bring distinction to himself, the department, the faculty and the university.”
Fellow faculty members emphasized the significance of the award for Canadian academia.
“This is Jacob’s day,” said Kumar Murty, a faculty member at the University of Toronto. “We’re celebrating intellectual achievement.”
Born in Kazan, Russia, Tsimerman moved to Canada in 1996. He completed his undergraduate degree at the University of Toronto at age 18 and earned his Ph.
D. from Princeton University in 2011.
