Gideon is a geochemist seeking to understand the ocean, the carbon cycle, and the long-term operation of the climate system. His research falls into two main areas:
- Making novel measurements on natural archives to quantify climate processes important for future change (e.g. sea level, rainfall patterns, weathering, permafrost stability),
- The chemistry of the modern ocean, including study of the carbon cycle, nutrient metals, contaminants, and tracers used to assess ocean processes.
He is a Professor at the Department of Earth Sciences (of which he was Head for 2013-2017) at the University of Oxford. He also holds a Senior Research Fellowship at University College Oxford, and an associate position at Columbia University, USA.
As a Fellow of the Royal Society, Gideon serves on the Society’s Science Policy Expert Advisory Committee and has chaired groups writing Royal Society policy reports on Ocean Resources and on Greenhouse Gas Removal.
Gideon helped initiate the international GEOTRACES programme which has revolutionized knowledge of the chemical cycling of metals in the ocean, and was co-chair of this programme for its first decade. He also co-founded the Oxford Geoengineering Programme, and has spoken to diverse audiences about geoengineering (as well climate change and oceanography), including to charities, business groups and at two World Economic Forums.