Hannah Fry (born 21 February 1984) is a mathematician, author, lecturer, television presenter, podcaster and public speaker. Her work includes studying the patterns of human behaviour, such as interpersonal relationship and dating and how mathematics can apply to them.^[1][2]

Fry is of Irish descent.^[3] She attended Presdales School in Ware, Hertfordshire, England,^[4] before studying mathematics at University College London (UCL).^[5] In 2011, she was awarded a PhD in fluid dynamics by UCL.^[6]

Fry regularly appears on radio and television in the UK, including in Computing Britain,^[7] The Curious Cases of Rutherford & Fry^[8] (with Adam Rutherford) and Music By Numbers. In the BBC 2 series City in the Sky,^[9]

On 30 March 2014, Fry gave a TED talk at TEDxBinghamtonUniversity^[10] titled "The Mathematics of Love", which has attracted over 4.3 million views.^[11] Following the TED talk, she published a book on the topic, The Mathematics of Love: Patterns, Proofs, and the Search for the Ultimate Equation, in which she applies statistical and data-scientific models to dating, sex and marriage.^[12]

In 2015, Fry presented a film biography of Ada Lovelace for BBC television.^[13]

In 2016, Fry co-presented the television programme Trainspotting Live with Peter Snow, a three-part series about trains and trainspotting, for BBC Four.^[14] She also hosted The Joy of Data, which examines the history of data and how they affect us today.^[15] A further credit for the year was her co-hosting an episode of the UK TV series Horizon with Dr Xand van Tulleken, titled "How to Find Love Online".^[16]

In 2017, Fry presented an episode of Horizon titled "10 Things You Need to Know About the Future".^[17] The following year, she presented Contagion! The BBC Four Pandemic, a programme about the possible impact of a flu pandemic.^[18]

Fry has appeared in several videos for a YouTube mathematics channel, Numberphile, run by Brady Haran.^[19] She has also made an appearance on his podcast, The Numberphile Podcast.^[20]

In 2018, Fry hosted a one-off 90-minute special of the BBC science programme Tomorrow's World along with four presenters from the show's original run, Maggie Philbin, Howard Stableford, Judith Hann and Peter Snow.^[21]

In 2019, Fry presented a BBC Four show titled A Day in the Life of Earth.^[22] The show revealed how much our planet can change in a single day and how these daily changes are essential to our existence.

Dr Fry has also presented a BBC television show titled "The Honest Supermarket", which covered a range of issues: from best before dates and their impact on food waste, to microplastics within our food, and the impact our food consumption has on the enivronment and carbon emmissions.

Fry has written three books. The first, The Mathematics of Love: Patterns, Proofs, and the Search for the Ultimate Equation (2015), includes the "37% rule", a form of the secretary problem according to which roughly the first third of any potential partners should be rejected. The second, The Indisputable Existence of Santa Claus (2016, co-authored with fellow mathematician, Thomas Oléron Evans), discusses various Christmas-related topics and how mathematics can be involved in them, including a fair Secret Santa, decoration of Christmas trees, winning at Monopoly, and comparing the vocabulary of the Queen's Christmas message to Snoop Dogg.^[5] Her third book is Hello World: How Algorithms Will Define Our Future and Why We Should Learn to Live with It (2018), which looks at the impact of algorithms that affect lives.

In 2013, Fry won the UCL Provost's Public Engager of the Year award.^[23] The award recognises the work that UCL's staff and students are doing to open up the university. Fry was nominated for her broad portfolio of public engagement activities.^[23]

In 2018, the Institute of Mathematics and its Applications and the London Mathematical Society announced that Fry had won that year's Christopher Zeeman Medal "for her contributions to the public understanding of the mathematical sciences".^[24]

Fry is married.^[25]