His discoveries changed long-held assumptions that chalk was a simple and uniform material, revealing instead a far more complex geology with major implications for tunnelling, foundations, transport routes and coastal stability. That research went on to influence nationally significant projects including the Channel Tunnel Rail Link (HS1), Crossrail, HS2 and the Thames Tideway scheme, as well as offshore energy developments in the North Sea.
Professor Mortimore joined Brighton Polytechnic, now the University of Brighton, in 1974 and spent 33 years helping build its reputation in engineering geology, teaching generations of students while forging close links between academia and industry. He also played a leading role in developing professional guidance that became the benchmark for designing and constructing in chalk ground conditions across the UK and parts of Europe.
Professor Mortimore said: “It came as a real surprise. I never expected to receive something of this stature, so it means a tremendous amount. When you look at the list of previous recipients, including Charles Darwin, it is humbling beyond words. I would never place myself in that company, so to be recognised in this way is extraordinary. This honour belongs not just to me, but to the many colleagues, students, researchers and industry partners I have worked with over the years. Science is always a shared endeavour.”
“People once thought chalk was rather dull and straightforward. But it turned out to be full of complexity, movement and surprises, and understanding that changed everything for engineering. What has always driven me is linking good science to real-world problems. If you understand the geology properly, you can build better, safer and smarter.”
On his long connection with Brighton, Professor Mortimore said: “So much of this journey began at the University of Brighton. The university gave me the freedom to explore ideas, work across disciplines and build strong partnerships with industry. It was a wonderful place to develop research.”
The Geological Society of London praised Professor Mortimore’s lasting impact on both science and society, recognising a career that successfully bridged academic discovery with real-world application.
Professor Donna Whitehead, Vice-Chancellor of the University of Brighton, said: “Professor Rory Mortimore’s extraordinary achievement is a source of immense pride for the University of Brighton. His career exemplifies the very best of Brighton research: intellectually rigorous, globally influential and deeply connected to solving practical challenges. He has inspired generations of students and colleagues, and this honour is a richly deserved recognition of a lifetime of contribution to science and engineering.”
Professor Mortimore has also authored major field guides, textbooks and technical publications that bridge academia and industry, and has played a central role in cross-disciplinary initiatives linking geology, hydrogeology and petroleum engineering.
Even in retirement, he remains active in research and consultancy through ChalkRock Ltd., while continuing to investigate geological links between southern England, the North Sea and internationally significant prehistoric landscapes such as Stonehenge.
The Wollaston Medal will be formally presented at the Geological Society of London’s President’s Day ceremony in June.