Youngest-ever Fields Medal winner Jean-Pierre Serre turns 100, still doing mathematics

More than 300 mathematicians gathered at the Institut Henri Poincare in Paris, France, on Sept. 15, Serre's 100th birthday, for a two-day conference honoring his career, French newspaper Le Monde reported. About 500 others followed online.

Called "Serre 100," the event brought together prominent mathematicians including Fields Medalists Pierre Deligne and Maryna Viazovska, as well as Peter Sarnak and Don Zagier. Fields Medalist Terence Tao was among the members of its scientific committee.

The International Mathematical Union, which awards the Fields Medal, said in a post marking Serre's 100th birthday that his work has "profoundly influenced the development of mathematics over many decades."

Unable to travel to Paris from Lausanne, Switzerland, where he lives, Serre joined remotely and gave a mathematical presentation. During the conference, he reflected on what still gives him satisfaction in mathematics, saying he takes pleasure in watching the field advance.

French mathematician Luc Illusie, one of the organizers and a longtime friend, told Le Monde that Serre did not want the conference to celebrate his past work and instead wanted to learn new things.

French mathematician Jean-Pierre Serre. Photo courtesy of College de France

Born in Bages, southern France, Serre studied at the Ecole Normale Superieure in Paris and earned his doctorate from the University of Paris in 1951.

Three years later, he received the Fields Medal for major contributions to topology and complex-variable theory. At 27, he became its youngest-ever recipient, a record he still holds more than seven decades later. Awarded every four years, the Fields Medal is widely regarded as one of the highest honors in mathematics.

Serre became a professor at the College de France in 1956 and remained there until retiring in 1994. His work has spanned algebraic topology, algebraic geometry and number theory, influencing generations of mathematicians.

He has produced more than 280 research papers and around 20 books. At the College de France, he was known for delivering lectures without notes and for quickly spotting errors, sometimes interrupting speakers over mathematical mistakes or even poor French.

He also had a playful side, once giving a presentation on how to write mathematics badly by deliberately demonstrating practices he disliked.

Away from mathematics, he climbed rocks in the Fontainebleau forest and played long games of table tennis.

In 2003, Serre became the first recipient of the Abel Prize, another of mathematics's most prestigious international awards.

Retirement did not end his mathematical work. His fifth and final volume of collected papers, covering work through 2025, was published in June. It includes a paper published in 2024, while another work remained in prepublication and was updated in late 2025.

He has also embraced technologies that did not exist for most of his career, communicating through email and social media and experimenting with chatbots.

He remains interested in areas of mathematics he has yet to explore.

Asked an interview with the European Mathematical Society this month whether aging had diminished his interest in any areas of mathematics, he said the opposite had happened.

"I cannot think of any. It rather goes in the other direction. Getting older made me appreciate topics of which I was ignorant (or even did not like) when I was a beginner."