Prof Martin TSUI never imagined his path would lead from Hong Kong’s polluted waters in the 1980s to the pristine ice of Antarctica. Yet this unexpected journey—spanning over 20 years of groundbreaking mercury research—perfectly embodies the combination of intellectual curiosity and communal engagement that CW Chu College champions.

As an Associate Professor jointly appointed to the School of Life Sciences and Department of Earth and Environmental Sciences, Martin has become one of CUHK’s leading voices in environmental pollution research. His involvement in China’s 41st Antarctic Expedition not only marks a scientific milestone but is also a powerful testament to how curiosity can transform both careers and perspectives.

Martin’s journey began during his childhood in 1980s and 1990s Hong Kong, when environmental degradation was visible throughout the region. ‘I witnessed first-hand environmental changes and degradation, which made me realise this was a topic I wanted to dedicate my career to,’ he reflects.

That early awareness led him to study biology at HKUST, though his true calling emerged during a senior-year research project in a marine science lab. ‘Research felt different—it was creative and impactful,’ he explains. ‘That realisation led me to pursue graduate studies and eventually my PhD in the US.

The mercury mystery

Among all possible research areas, Martin chose to focus on mercury—a decision that began by chance but evolved into a passionate pursuit. ‘Mercury is toxic and poses a serious global concern, but it also displays chemical behaviours unlike any other element,’ he notes. ‘Studying it constantly reveals new scientific surprises.’

His expertise in mercury biogeochemistry has positioned him as a leading researcher in the field, with his work contributing to our understanding of how this toxic element cycles through the ecosystem.

Martin credits three key mentors for shaping his research trajectory. Prof Wen-Xiong Wang from HKUST (currently at CityU of HK) introduced him to rigorous scientific work, while Prof Jacques Finlay at the University of Minnesota broadened his ecological perspective. Perhaps most influential was Prof Joel Blum at the University of Michigan, who pioneered mercury isotope analysis despite widespread scepticism.

“Professor Blum’s persistence taught me that ‘making the impossible possible’ is at the heart of scientific progress,” Martin recalls.

Antarctic adventure: a once-in-a-lifetime experience

Martin was invited to join China’s 41st Antarctic Expedition and became part of the first batch of Hong Kong scientists stationed at the Great Wall Station in December 2024.

The experience proved transformative. ‘The extreme stillness, lack of visible life, and raw landscape made me reflect deeply on the resilience of life and the fragility of our planet,’ he shares. Beyond personal reflection, the expedition enabled crucial sample collection for his mercury research.

When asked if he would lead student expeditions to Antarctica, Martin’s response is immediate: ‘Definitely, yes! It would be an incredible experience for students, especially those who never imagined going there.’

Beyond the laboratory

As a member of CW Chu College, Martin embraces CUHK’s unique college system, which provides holistic community interactions beyond academics. ‘I see my role as guiding students not just academically, but personally—to help them become curious, responsible, and globally-minded citizens,’ he explains.

Whether sharing research discoveries or Antarctic adventures, Martin aims to show students that ‘the unknown should excite us, not intimidate us.’ He has accompanied students on educational trips, including explorations of modern Chinese history in Nanjing during a winter break two years ago.

Martin’s career philosophy reflects the unpredictable nature of both scientific discovery and life itself. ‘I believe life’s path is rarely straightforward, and that’s what makes it beautiful,’ he concludes. ‘Every unexpected turn teaches us something new. Science and education share that same principle: curiosity leads to discovery, and discovery leads to growth.’

As CW Chu College continues fostering the next generation of involved global citizens, Martin’s journey—from Hong Kong’s polluted waters to Antarctica’s pristine ice—serves as an inspiring reminder that curiosity, persistence, and mentorship can lead to extraordinary discoveries.