University of Toronto mathematics professor Jacob Tsimerman has been awarded the 2026 Fields Medal, one of the world’s most prestigious honours in mathematics. He becomes the first scholar based at a Canadian institution — and only the second Canadian — to receive the medal since it was established in 1932.
Tsimerman received the award on Thursday at the International Congress of Mathematicians in Philadelphia. The Fields Medal is presented every four years by the International Mathematical Union to mathematicians under the age of 40 in recognition of outstanding achievements and the potential for future breakthroughs.
The University of Toronto professor was recognized for major contributions to arithmetic and complex algebraic geometry, including his role in proving the long-standing André-Oort conjecture. His research also contributed to resolving the Griffiths conjecture and has opened new directions for mathematical research.
Tsimerman described receiving the medal as an “incredible honour” and emphasized the importance of his collaborators in his achievements. The University of Toronto called the award a historic moment for the institution and Canadian mathematical research.
The achievement has an additional connection to the university. The Fields Medal is named after John Charles Fields, the Canadian mathematician who was both an alumnus and professor at the University of Toronto. The medal recognizes exceptional existing mathematical work as well as the promise of future achievement.
Tsimerman shares the 2026 Fields Medal honours with mathematicians Yu Deng, John Pardon and Hong Wang. The four recipients work across areas ranging from number theory and geometry to mathematical physics.
Tsimerman’s victory marks a significant milestone for Canadian mathematics, bringing one of the discipline’s highest international honours to a researcher working at a Canadian university for the first time.