Hannah Fry

• 1. Introduction

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  Hannah Fry told a BBC Four audience in 2018 that she was about to simulate a fatal outbreak across the whole United Kingdom. If the experiment worked, she said, it would "save lives when, not if, a real pandemic hits." The programme was called Contagion! The BBC Four Pandemic. Its first simulated infection began in Haslemere, Surrey. In February 2020, that same town saw the first recorded case of a person catching COVID-19 from within the UK. The match was a coincidence, yet it shows how often Fry's work sits close to events that matter. She is a British mathematician, author and broadcaster. How does someone trained as a mathematician become a voice that a wide public wants to hear? What did she study, and what does she think people get wrong about maths?

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• 2. A Page A Day

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  One summer, when she was about 11, Hannah Fry's mother handed her a mathematics textbook and a rule: solve one page of problems every day of the holiday. The routine paid off when school resumed, because it left her ahead of the other pupils. Fry was born in Essex, England, on the 21st of February 1984. She was the middle of three sisters and grew up in Hoddesdon and Ware, in Hertfordshire. Her father was an English factory worker who made hydraulic lifts for lorries. Her mother, who was Irish Catholic, stayed at home. At Presdales School in Ware, a teacher inspired her to pursue mathematics. She went on to take a degree in mathematics at University College London. In 2011 she completed her doctorate there under the supervision of Frank T. Smith. Her research covered fluid dynamics and the Navier-Stokes equations. That field was a long way from the human puzzles she would later become known for.

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• 3. Cities To Cambridge

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  In 2012, University College London appointed Fry as a lecturer at its Centre for Advanced Spatial Analysis. Promotion followed, first to senior lecturer and then to professor in the Mathematics of Cities. In 2024 she became president of the Institute of Mathematics and its Applications. Alongside the titles, she has pushed back against the stereotype that mathematics is "boring" and not worth studying. She admits the subject is difficult. Her view is that it can still be framed in a way that people recognise themselves in. In January 2025 she joined the Faculty of Mathematics at the University of Cambridge, where she is also a fellow of Queens' College. Her post is Professor of the Public Understanding of Mathematics. No one had held that title at the university before her.

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• 4. Stand-Up To Screen

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  In 2015, Fry began performing stand-up comedy, and that move led to a TED Talk and then to television work. The same year she presented a BBC Four film biography of the computing pioneer Ada Lovelace. On BBC Radio 4 she co-hosts The Curious Cases of Rutherford & Fry with Adam Rutherford. From series 22, in September 2024, Dara Ó Briain took over from Rutherford as her co-presenter. Her television work widened quickly. In 2016 she co-presented Trainspotting Live with Peter Snow, a three-part BBC Four series about trains and trainspotting. That year she also co-hosted an episode of BBC Two's Horizon with Dr Xand van Tulleken, titled How to Find Love Online. Other BBC series followed. In City in the Sky on BBC Two she studied the logistics of aviation. On BBC Four she hosted The Joy of Data, which examines the history and human impact of data. She later hosted a one-off 90-minute special of Tomorrow's World alongside four of its earlier presenters: Maggie Philbin, Howard Stableford, Judith Hann and Peter Snow. In 2019 she fronted A Day in the Life of Earth on BBC Four, about how the planet changes within a single day. That year she also gave the Royal Institution Christmas Lectures, titled Secrets and lies, on the hidden numbers, rules and patterns that govern daily life. She was only the fourth mathematician ever to deliver them, and they were broadcast on BBC Four.

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• 5. Pandemic Years

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  By 2020, Fry was co-presenting The Great British Intelligence Test on BBC Two. Pandemic mathematics then became a regular part of her work. She presented further BBC programmes explaining the maths behind COVID-19 and other pandemics. In 2021 she was the guest interviewee on The Life Scientific on BBC Radio 4, and she has also appeared on Have I Got News for You. In July 2022 she presented the BBC Two documentary Unvaccinated, which asked why part of the British population remained unvaccinated against COVID-19. Reviews were sharp. Anita Singh of The Daily Telegraph called the programme patronising. She said Fry's "jelly-bean roulette" explanation of statistics treated the unvaccinated guests like "six-year-olds". Jack Seale of The Guardian wrote that it required "a near-saintly level of tolerance just to watch, never mind present". Later that year Fry turned to a very different subject on BBC Two, the everyday objects in people's wallets.

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• 6. Numbers In Public

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  The Secret Genius of Modern Life began in 2022 as a six-part BBC Two series. Fry used it to investigate topics such as how credit cards came about, how they are made and how they work, and where they may go next. The BBC commissioned a second six-part series, first broadcast in November 2023. One episode showed how the British passport is produced, took viewers inside a factory where passports are made, and criticised electronic gates at airports. In March 2023 she began presenting episodes of The Future With Hannah Fry on Bloomberg Originals. Later that year, Radio 4 started Uncharted with Hannah Fry, a series of 15-minute documentaries about graphs. For Channel 4's coverage of the 2024 United Kingdom general election, she was the chief number cruncher, analysing results as they arrived overnight. She correctly predicted that the Labour Party would win, and she cautioned the party to "dampen their expectations". Online, her YouTube channel has passed 100 million views. In November 2025 she began the podcast The Rest Is Science with Michael Stevens, known as Vsauce. That month she also presented The Infinite Explorer, a six-part National Geographic documentary series. The following year came AI Confidential with Hannah Fry, a three-part documentary series. In autumn 2026 she is set to appear on the second series of The Celebrity Traitors.

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• 7. Books And Honours

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  The "37% rule" sits inside Fry's first book, The Mathematics of Love: Patterns, Proofs, and the Search for the Ultimate Equation, published in 2015. It is a form of the secretary problem, and it advises rejecting roughly the first third of potential partners. Fry has authored or co-authored four books. Her second, also from 2015, is The Indisputable Existence of Santa Claus. It applies maths to Christmas, from running a fair Secret Santa to decorating trees and winning at Monopoly. It even compares the vocabulary of the Queen's Christmas message with the lyrics of Snoop Dogg. Hello World: How to be Human in the Age of the Machine followed in 2018 and looks at algorithms that affect people's lives. In 2021 she wrote Rutherford & Fry's Complete Guide to Absolutely Everything (Abridged) with Adam Rutherford. Recognition accumulated alongside the books. In 2018 the Institute of Mathematics and its Applications and the London Mathematical Society gave her the Christopher Zeeman Medal for her contributions to the public understanding of the mathematical sciences. In 2020 Hello World won the Asimov Prize, a literary-scientific award organised by Italy's INFN and the Gran Sasso Science Institute. That year the Institution of Engineering and Technology also made her an honorary fellow, on its 150th anniversary. The Royal Academy of Engineering did the same in 2022, and the Learned Society of Wales followed in 2023. In 2024 the Royal Society gave her the David Attenborough Award, calling her the "foremost populariser of maths in the country". Another event in 2020, the year of two of those honours, would shape her work in a very different way.

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• 8. Facing Cancer

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  In 2020, Fry was diagnosed with cervical cancer and underwent a radical hysterectomy. She turned the experience into a documentary, Making Sense of Cancer with Hannah Fry, which she wrote and presented for BBC Two's Horizon. The film covers her treatment and its long-term effects, which included lymphoedema, a chronic swelling condition. It also examines the statistics around disease screening and the way patients and doctors make decisions. Afterwards, Fry had a reconstructive operation called lymphaticovenular anastomosis. Looking back, she wrote of her treatment that "we took a very risk-averse route that we didn't need to". She also said she regretted that she could not have a third child. She lives in South London, where she co-parents her two daughters with her ex-husband.

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