A graduate of the University of Sheffield, where he studied Zoology before completing a PhD in Pure Science, Geoff has built an internationally distinguished career spanning academia, public health and global philanthropy.
Today, he serves as Deputy Director for Global Health on the Tuberculosis and HIV team at the Bill & Melinda Gates Foundation.
Reflecting on receiving an honorary degree from his alma mater, Geoff said: “I greatly enjoyed my time at Sheffield and was lucky to have such good teachers and mentors. I am grateful for being recognised by an institution that I greatly respect.”
Throughout his career, he has helped shape the global response to HIV through innovative approaches to prevention, testing and treatment. His work has supported the development and scale-up of HIV self-testing, differentiated models of care and new prevention strategies, while more recently exploring how artificial intelligence and advanced data analysis can improve healthcare delivery.
Although his PhD at Sheffield focused on chickenpox and shingles, Geoff's research interests quickly evolved as the HIV epidemic emerged.
“Chickenpox and shingles are diseases caused by the same virus and understanding the interactions between the diseases made for an interesting subject. When I finished my PhD, HIV was a global challenge and it was natural to move to study HIV, but I recognised that much could be learned from the parallel with other sexually transmitted diseases and I became interested in the history and social dimensions of these diseases as well as their clinical and epidemiological peculiarities.”
Looking back on his time at Sheffield, Geoff credits the University with helping shape the approach that has guided his career.
As a student I learned to engage with, and enjoy, tackling varied problems. The willingness to embrace challenges and get enjoyment from them is something I have taken with me throughout my career.
His expertise has informed the work of numerous international organisations and advisory groups. He has served as Chair of the UNAIDS Reference Group on Estimates, Models and Projections, contributed to several Institute of Medicine and Wellcome Trust panels, co-authored hundreds of scientific publications, and helped coordinate influential reports that have shaped global policy and practice in HIV prevention and care.
As the Class of 2026 graduates alongside him, Geoff offered one piece of advice for those beginning the next chapter of their own journeys:
Always seek to learn and grow so that you can find new and interesting challenges as you go.