"I am described as a scientist but really I have always been an explorer," Peter Barrett said in 2004. Professor Peter Barrett died unexpectedly in Christchurch, New Zealand on 26 September 2026, doing exactly what he loved. At the age of 86, he was planning his next film to raise the climate change alarm for Antarctica, and all of us—a cause he had devoted much of his life to. Barrett was one of the founders of modern Antarctic Earth science. His early Antarctic explorations helped confirm that the southern continents were once joined. His subsequent drilling campaigns in the 1970-1990s then revealed the long and surprising history of the Antarctic ice sheets. The research centre he founded became world-renowned. And for four decades he urged the public and policymakers to act on what the rocks were telling us about climate change and our future.
Explorer from the start
Peter grew up on a Waikato dairy farm. His instinct for exploration showed early. As a Hamilton Boys High School student in 1955, he and two friends discovered a Waitomo cave later named "Rumbling Gut". Caving drew him to the Te Kuiti limestones, the subject of his Auckland University MSc thesis. In 1962, by chance, he joined a University of Minnesota expedition to the Ellsworth Mountains, and in 1963 he was part of a New Zealand Antarctic field party. Those seasons took him to The Ohio State University for a PhD on the Gondwana (Beacon) strata of the central Transantarctic Mountains.
On 28 December 1967, at Graphite Peak, he found a fragment of fossil jaw in the Triassic Fremouw Formation. It came from a labyrinthodont amphibian, and it was the first fossil of a four-limbed land animal ever found in Antarctica. Animals like it could not have crossed open ocean, so the find was powerful evidence for the supercontinent Gondwana and helped to settle the debate over continental drift and plate tectonics. At Ohio State he also met the glacial geologist John Mercer. Mercer later warned that the West Antarctic Ice Sheet could be lost to fossil-fuel warming, and his influence shaped Barrett's thinking for the rest of his career.
Building the Antarctic Research Centre
Barrett returned to Victoria University of Wellington in 1970, became Senior Lecturer in Geology in 1971, and was the first Director of the Antarctic Research Centre (ARC) from 1972 to 2007. In the early days he was key in establishing the Research School of Earth Sciences, as it was known then, and was head of School in the early 1990s. He developed many lifelong friendships and enjoyed sparring in the staff club with some of the true characters of New Zealand Earth sciences. He taught sedimentology for decades, including taking dozens of students into backcountry regions to learn fundamental mapping techniques. Decades later, his most-cited paper was still a 1980 review of the shape of rock particles in Sedimentology. Former students remember lectures in which he rethought textbook orthodoxy as he went, and a teacher who treated even undergraduates as colleagues. Even in his retirement, he was still a passionate supporter of students and the University.
He led many Victoria University Antarctic expeditions, and generations of students went south because of him. With Professor Bob Clark, he made it possible for a female student, Rosemary Askin, to join VUWAE 15 in 1970–71, at a time when women were rarely included in Antarctic fieldwork. His advice to every expedition became a tradition—help with the boring jobs at Scott Base, come back safely, "and apart from that, enjoy yourself."
He had a gift for spotting talent and was, as colleagues put it, very hard to say no to. He had personally recruited or mentored three researchers, who went on to succeed him as director of ARC—Tim Naish (2008-2017), Andrew Mackintosh (2017-2019) and Rob McKay (2019 onwards). This is just a small example of his exceptional mentorship. Many other students went on to successful careers and leadership roles in science, both in New Zealand and internationally. He also saw early that geological evidence should be combined with computer modelling of ice sheets and climate. That approach runs through ARC's work and through the international programmes he helped shape.
Drilling back to the future
Barrett’s most lasting scientific legacy came from drilling. In 1972–73 he sailed on the Glomar Challenger on Leg 28, the Deep Sea Drilling Project's first voyage to Antarctica. Its Ross Sea cores showed that Antarctic glaciation was far older than had been thought. He filmed the voyage himself with a clockwork 16 mm camera, and the resulting film, Challenger Sails South, was shown on New Zealand television.
From 1974 to 1999, often with US-based Kiwi Peter Webb, he led a series of drilling projects from the sea ice of McMurdo Sound culminating in the Cape Roberts Project. CIROS-1 was drilled in 1986, in close partnership with Alex Pyne, who was to become Barrett’s right-hand man, as the ARC’s talented polar drilling technologist. It reached 702 metres below the sea floor with about 98 per cent core recovery. It pushed the record of Antarctic glaciation back to around 34 million years and set the standard for everything that followed.
The Cape Roberts Project (1997–99) was a high-risk venture backed by the Antarctic programmes of seven nations, with Barrett as Chief Scientist. Its framework, with the United States, New Zealand, and Italy sharing the drilling costs equally, was sketched out over a beer in Bariloche in 1992 with Fred Davey and Carlo Alberto Ricci. The cores recorded how the ice sheet and climate behaved between 34 and 17 million years ago, a period when carbon dioxide levels were higher than today. Colleagues credit its success to Barrett's "quiet and resolute persistence" and the international respect he commanded. At the end of the project, he and Webb urged the next generation to keep going. They did, through ANDRILL and later ocean drilling expeditions in the Ross Sea.
Barrett was also willing to change his mind in public. He was a central figure in the "Sirius debate" over whether the giant East Antarctic Ice Sheet had largely collapsed about three million years ago. After years of supporting that view, he accepted the growing evidence for a less dynamic ice sheet than had originally been proposed and said so openly, ultimately landing somewhere in the middle that only edges of the ice sheet now connected to the ocean were vulnerable to collapse, which the ANDRILL project subsequently confirmed. Those who saw it remember it as a lesson in intellectual honesty.
International leadership
From the early 1980s, Peter Barrett was New Zealand's geology delegate to the Scientific Committee on Antarctic Research (SCAR). He joined the steering committee of the ANTOSTRAT project in 1989 and co-founded SCAR's Antarctic Climate Evolution programme in 2002, which brought geological records and models together. That programme was succeeded by SCAR's PAIS and INSTANT programmes, which carry the same approach forward. From 2015 to 2017 he chaired the committee for SCAR's Tinker-Muse Prize for Science and Policy in Antarctica.
He cared as much about protecting Antarctica as studying it. He served on SCAR's Group of Specialists on Environmental Affairs and Conservation from 1988 to 2002. From 1998 to 2003 he was New Zealand's first delegate to the Antarctic Treaty's Committee for Environmental Protection, where he helped put the Environmental Protocol into practice. In 2010 he represented New Zealand at the Antarctic Treaty Meeting of Experts on Climate Change in Norway.
Saving the ARC and securing its future
In 2000, soon after the Cape Roberts Project's success, a university restructuring threatened to make the ARC's staff redundant. Students marched to Parliament, and letters of support arrived from around the world. Barrett stayed calm and professional, and the Centre survived. He then set out to make it secure, and by teaming up with Tim Naish, then at GNS Science, they secured ARC’s first large collaborative government research grant. Later philanthropic support from Dr S.T. Lee, established the annual S.T. Lee Lecture in Antarctic Studies in 2003 and a new ARC premises. In 2004 he launched the ARC Endowed Development Fund, which now funds postgraduate grants and PhD scholarships in perpetuity. A major gift from alumnus Alan Eggers in 2007 helped start the Centre's work on ice sheet modelling.
In 2006 he helped create the joint Antarctic Research Institute with GNS Science, which supported ANDRILL, and built New Zealand's ice-core capability to be led by Nancy Bertler, Barrett’s former PhD student. That work later led to the nine-nation Roosevelt Island Climate Evolution project, led by Nancy. The close relationship between the ARC with GNS Science (now Earth Sciences New Zealand) grows from strength to strength. At its lowest point in 2000, ARC had two staff. Today it is thriving with 29 staff and a similar number of postgraduate students, under the leadership of another former PhD student, Rob McKay.
A voice for the future
Barrett understood early what the geological record meant for a warming world. From the early 1980s, before the first IPCC report, he warned that rising carbon dioxide threatened the West Antarctic Ice Sheet. In 2006 he began Thin Ice – the inside story of climate science, with geologist and filmmaker Simon Lamb, the University of Oxford and director David Sington. Over nearly ten years, with very little money and a great deal of persistence, he acted as its executive producer. The film was launched in 2013 at around 200 venues on all seven continents, won several awards, and was broadcast more than 400 times on American television. He also contributed to Gareth Morgan's 2009 book Poles Apart, which tested the science against prominent climate sceptics. He also supported the Wise Response appeal for action on climate change.
He insisted that there was hope. At the SCAR 2016 conference, he reminded colleagues that new ice sheet projections contained a good-news story as well: with strong mitigation, "we can keep our ice sheets". In 2020 he shared the Prime Minister's Science Prize with the Melting Ice, Rising Seas team, and the ARC's $400,000 prize was donated to the Endowed Development Fund that Barrett had set up 16 years earlier.
National and international recognition
In 1963–64, Barrett Glacier, which flows to the Ross Ice Shelf, was named after him. He received the Polar Medal in 1978 and was elected a Fellow of the Royal Society of New Zealand in 1993. His other honours included the Accademia dei Lincei's Premio Internazionale Felice Ippolito (2001), the Marsden Medal (2004), SCAR's inaugural President's Medal for Outstanding Achievement in Antarctic Science (2006), and Wellingtonian of the Year (2006). He became Patron of the New Zealand Antarctic Society in 2008, succeeding Sir Edmund Hillary, recruiting young members, and organising events. He remained highly active in this role throughout his retirement, and used it to strengthen the Society’s voice in advocating for the protection of Antarctica and the science that is undertaken there. He received the New Zealand Antarctic Medal in 2010 and became an Honorary Fellow of the Geological Society of London in 2011, a distinction held by only about 70 people worldwide.
His legacy
Peter Barrett's career spanned the modern history of Antarctic geoscience. His fossil discovery helped confirm the emerging theory of plate tectonics. His drill cores showed an ice sheet that has grown and shrunk with climate for 34 million years, and have become a harbinger for its future. The Antarctic Research Centre, which he founded, defended and endowed, carries his spirit and builds on the legacy he created. Colleagues describe that spirit as a place where "the task gets done because it needs doing" and where people enjoy the work alongside good companions.
He was a field geologist, an international diplomat for science with many close colleagues and friends spread around the world, a steward of the continent he studied, and an advocate who kept telling the public what the rocks were saying. Above all he was a mentor. His students and colleagues now lead Antarctic programmes around the world, and many of them say they would not be in Antarctic science without him. They will miss his curiosity, his dogged persistence, his generosity with ideas and introductions, and his conviction that science should serve society.