Watch the Q&A session here: https://youtu.be/_HJt1zjecCo

The major environmental challenge of our time is framed in terms of what happens in our atmosphere, and specifically what are called “greenhouse gases”. But what is an atmosphere, and how does it behave? Does the atmosphere vary across the world, and what enters and leaves it normally? This lecture will explore how humanity has taken some things from the air and put other things into it, what the effects have been, and what this means for our future.

This lecture was recorded by Professor Helen Czerski on the 22nd January 2026 at Barnard’s Inn Hall, London.

Dr Helen Czerski is a physicist and oceanographer with a passion for science, sport, books, creativity, hot chocolate and investigating the interesting things in life.

She is an Associate Professor at the Department of Mechanical Engineering at University College London and her research focus is the physics of breaking waves and bubbles at the ocean surface. These bubbles change underwater sound and light, help transfer gases from ocean to atmosphere (helping the ocean breathe) and also eject ocean material into the air. She has spent months working on research ships in the Antarctic, the Pacific, the North Atlantic and the Arctic, and is an experienced field scientist.

Helen has been a regular science presenter on the BBC for 15 years, covering the physics of the natural world in BBC2 landmark documentaries (including ‘Orbit’, ‘Operation iceberg’ and ‘Supersenses’), and the physics of everyday life in a range of BBC4 documentaries (including ‘From ice to fire: The incredible science of temperature’, ‘Sound waves: The symphony of physics’, and ‘Colour: The spectrum of science’, along with many others). She currently co-hosts BBC Radio 4’s flagship climate and environment programme Rare Earth.

Helen's first book Storm in a Teacup won the Italian Asimov Prize and the Louis J. Battan Author prize from the American Meteorological Society. Blue Machine won the Wainwright Prize for Conservation Writing. She was awarded the Institute of Physics Gold Medal in 2018 for her work on physics communication, and an Honorary Fellowship of the British Science Association in 2020. She has been a Trustee of Royal Museums Greenwich since 2018, and was one of the 2020 Royal Institution Christmas Lecturers, giving her Lecture on the topic of the ocean.

The transcript and downloadable versions of the lecture are available from the Gresham College website: https://www.gresham.ac.uk/watch-now/ocean-air

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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The cult of Mithras was by far the most famous of the mystery religions of the Roman Empire: private societies of worshippers devoted to a particular deity. It was supposed to have come from Persia, but was actually developed by the Romans themselves and was especially popular in the northern parts of the empire, including Britain. This lecture considers its shrines, myths, membership and rituals, to see how far we can penetrate the secrecy in which it was shrouded.

This lecture was recorded by Ronald Hutton on the 28th of January 2026 at Bernard’s Inn Hall, London

Professor Hutton is Professor of History at the University of Bristol. He took degrees at Cambridge and then Oxford Universities, and was a fellow of Magdalen College, Oxford. He is now a Fellow of the British Academy, the Royal Historical Society, the Society of Antiquaries and the Learned Society of Wales, and has won awards for teaching and research.

He has lectured all over the world, authored twenty books and ninety-six essays, appeared in or presented scores of television and radio programmes, and sits on the editorial boards of six journals concerned with the history of religion and magic.

He is currently working on the third volume of his biography of Oliver Cromwell.

The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/god-mithras

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today

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Grieving is a uniquely human emotion – or is it? Is the apparent attachment of elephants or orcas to the bodies of dead relatives a sign of grief, or simply an instinctive behaviour without emotional implications? Why do some people seem able to handle grief so much better than others? And how close are we to finding a pharmaceutical ‘cure’ for grief…and if we find it, should we use it?

This lecture was recorded by Professor Robin May on the 21st of January 2026 at Barnard’s Inn Hall, London

Professor of Infectious Disease at the University of Birmingham, and (interim) Chief Scientist at the UK Health Security Agency, Robin May was appointed Gresham Professor of Physic in May 2022. Between July 2020 and September 2025 he served as Chief Scientific Adviser at the Food Standards Agency (FSA).

Professor May’s early training was in Plant Sciences at the University of Oxford, followed by a PhD on mammalian cell biology at University College London and the University of Birmingham. After postdoctoral research on gene silencing at the Hubrecht Laboratory, The Netherlands, he returned to the UK in 2005 to establish a research program on human infectious diseases. He was Director of the Institute of Microbiology and Infection at the University of Birmingham from 2017-2020.

Professor May continues his work on Infectious Disease at the University of Birmingham. A Fellow of the Academy of Medical Sciences, Wolfson Royal Society Research Merit Fellow and Fellow of the American Academy of Microbiology, Professor May specialises in research into human infectious diseases, with a particular focus on how pathogens survive and replicate within host organisms.

As the FSA’s Chief Scientific Adviser, Professor May provides expert scientific advice to the UK government and plays a critical role in helping to understand how scientific developments will shape the work of the FSA, as well as the strategic implications of any possible changes.

The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/why-grieve

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today

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Constable’s painting The Cornfield celebrates its bicentenary in 2026. How has it aged? This is a landscape that has acquired iconic status – a marker of national identity -- as a representation of typically English countryside. How has that Englishness been constituted in the painting? And how does The Cornfield (a view of a partly working landscape) speak to current ideas about relationships and tensions between the natural world and the human presence, especially in our age of environmental anxieties?

This lecture was recorded by Malcolm Andrews on 20th January 2026 at Barnard’s Inn Hall, London.

Malcolm Andrews is Professor (Emeritus) of Victorian and Visual Studies, University of Kent. He was the Editor of The Dickensian, the journal of the Dickens Fellowship, and a past President of the Dickens Society of America.

The transcript and downloadable versions of the lecture are available from the Gresham College website:https://www.gresham.ac.uk/watch-now/constable-200

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham's mission, please consider making a donation: https://gresham.ac.uk/support/

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Watch the Q&A session here: https://youtu.be/3B58-fA2b-4

"Colour is the keyboard, the eyes are the hammers, the soul is the piano with many strings." — Kandinsky

How do we ‘see’ music, or ‘hear’ images? From Newton’s colour scales assigning tones to the rainbow, artists and composers have long explored the deep connections between sound and vision.

Kandinsky’s Compositions and Improvisations; Klee’s polyphonic paintings, and Scriabin’s synaesthetic craft all reveal the scintillating interplay of visual and sonic art. This lecture traces their co-evolution and shared language, from spectral composers to technological translations of light into rhythm and melody, uncovering the hidden spectrum where music and colour intertwine.

This lecture was recorded by Milton Mermikides on the 14th of January 2026 at LSO St Luke’s, London

Milton Mermikides is a composer, guitarist, technologist, academic and educator in a wide range of musical styles and has collaborated with artists and scientists as diverse as Evelyn Glennie, Tim Minchin, Pat Martino, Peter Zinovieff, John Williams and Brian Eno. Son of a CERN nuclear physicist, he was raised with an enthusiasm for both the arts and sciences, an eclecticism which has been maintained throughout his teaching, research and creative career.
He is a graduate of the London School of Economics (BSc), Berklee College of Music (BMus) and the University of Surrey (PhD). He has lectured, exhibited and given keynote presentations at organisations like the Royal Academy of Music, TEDx, Royal Musical Association, British Library, Smithsonian Institute and The Science Museum and his work has been featured extensively in the press. His music, research and graphic art are published and featured by Oxford University Press, Cambridge University Press, Deutsche Grammophon, Sony and more, and he has won awards, scholarships and commendations for writing, teaching, research and his charity work.
Milton is Professor of Music at the University of Surrey, Professor of Guitar at the Royal College of Music, Deputy Director of the International Guitar Research Centre, an Ableton Certified Trainer, and lives in London with his wife, the guitarist Bridget Mermikides and their daughter Chloe. He is also a Vice-Chair of Governors at Addison Primary School, a state school which foregrounds music education, offering free instrumental lessons for all on Pupil Premium.


The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/music-light-colour

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today

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ChatGPT, the AI chatbot developed by OpenAI, was the fastest growing app in history. But this achievement, as sudden and remarkable as it might seem, was simply the most recent chapter in a fascinating story that has been unfolding for almost seven decades. This lecture explores the full history of the relationship between AI and work, and how economists have tried to make sense of it. It’s a journey that begins with a remarkable gathering of minds in a non-descript mathematics department at Dartmouth University in 1956 and ends with the technological convulsions that we see around us today.

This lecture was recorded by Daniel Susskind on the 13th of January 2026 at Bernard’s Inn Hall, London

Dr Daniel Susskind is a writer and economist. He explores the impact of technology, and particularly AI, on work and society. He is a Research Professor at King’s College London, a Senior Research Associate at the Institute for Ethics in AI at Oxford University, a Digital Fellow at the Stanford Digital Economy Lab, and an Associate Member of the Economics Department at Oxford University.

His new book, Growth: A Reckoning (2024), was chosen by President Obama as one of his ‘Favourite Books of 2024’ and was a runner-up for the Financial Times Business Book of the Year 2024. He is also the author of A World Without Work (2020), described by The New York Times as "required reading for any potential presidential candidate thinking about the economy of the future” and a runner-up for the Financial Times Business Book of the Year 2020, and co-author of the best-selling book, The Future of the Professions (2015). His TED Talk, on the future of work, has been viewed more than 1.6 million times. He is currently working on his next book, What Should Our Children Do? How to Flourish in the Age of AI.

Previously he worked in various roles in the British Government – in the Prime Minister’s Strategy Unit, in the Policy Unit in 10 Downing Street, and in the Cabinet Office. He was a Kennedy Scholar at Harvard University

The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/economics-ai

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today

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One of the first executive orders issued by President Trump in January was EO 14164 designed to “restore the death penalty”, though actually aimed at far more (including making the prison conditions of those commuted by Biden reflect the “monstrosity” of their crimes). We will explore what this means for the 2,400 people on America’s death row, at the same time as reviewing the rising levels of innocent people being executed – my own ‘Post Mortem Project’ indicating that as many as 13 percent of those killed since 1976 have strong innocence cases.

This lecture was recorded by Clive Stafford-Smith on the 4th of December 2025 at Bernard’s Inn Hall, London

Clive Stafford Smith JD OBE is a dual UK-US national, the founder and director of the Justice League a non-profit human rights training centre focused on fostering the next generation of advocates.

He was the Senior Prefect at Radley College, where he studied maths and science; then a Morehead Scholar at the University of North Carolina (Chapel Hill), where he took a degree in Politics; and a Stone Merit Scholar each of his three years at Columbia Law School, graduating in 1984.

He previously founded and directed the legal action charities Louisiana Capital Assistance Center (1993 in New Orleans) and Reprieve (1999 in London). Since 1984 he has tried many capital cases, and helped to represent over 400 people facing execution in the US and elsewhere. He also brought the first challenge to Guantánamo Bay, where he has secured the release of 85 detainees, and continues to assist the remaining 30. In all five of the cases he has helped bring to the U.S. Supreme Court the petitioner has prevailed.

He has recently taken on the case of Aafia Siddiqui, the woman who has most suffered from the US rendition-to-torture program – abducted with her three children. He continues to work on capital cases in the US, including a Post-Mortem Project where he is investigating the claims of innocence of 184 people executed since 1977.

Clive has published a number of books including Bad Men (2008, describing work in Guantánamo) and Injustice (2012, on the capital case of Kris Maharaj), both of which were short-listed for the Orwell Prize; and most recently The Far Side of the Moon (2023), deconstructing the parallel lives of his father and a client Larry Lonchar, both of whom were labelled Bipolar. He has many other publications, including manuals for the defence of capital cases, and law review articles about aspects of capital defence. He has worked on many films and documentaries, starting with Fourteen Days In May (1987), recently ranked as one of the top BBC documentaries of all time.

The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/trump-death

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today

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During the fifty years since the launch of the Viking spacecraft to Mars, our view of the red planet has changed from hostile desert to a world which was once covered in water, and which may just possibly sustain life. Lavishly illustrated with the latest images from the fleet of spacecraft that have explored our neighbour, this lecture considers how Mars’ fate, like that of Earth, was set in the Solar System’s first billion years, and the chaotic environment the process of planet formation produced.

This lecture was recorded by Chris Lintott on the 3rd of December 2025 at Conway Hall, London

Professor Chris Lintott is a Professor of Astrophysics at the University of Oxford, and a Research Fellow at New College.

Having been educated at Magdalene College, Cambridge and University College London, his research now ranges from understanding how galaxies form and evolve, to using machine learning to find the most unusual things in the Universe, to predicting the properties of visiting interstellar asteroids. He was the founder of the Zooniverse citizen science platform, which provides opportunities for more than two million online volunteers to contribute to scientific research, and which was the topic of his first book, 'The Crowd and the Cosmos’. His latest book is ‘Our Accidental Universe’.

Professor Lintott is best known for presenting the BBC's long-running Sky at Night program, and as an accomplished lecturer. Away from work, he cooks, suffers through being a fan of Torquay United and Somerset cricket, and spends time with a rescued lurcher, Mr Max. He can often be found at the helm of Oxford’s science comedy night, ‘Huh, That’s Funny’.

The transcript of the lecture is available from the Gresham College website: https://www.gresham.ac.uk/watch-now/mars-love

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. There are currently over 2,500 lectures free to access. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: https://www.gresham.ac.uk/get-involved/support-us/make-donation/donate-today

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