Steven Chown is widely recognised as a pre-eminent authority on the biodiversity and conservation of Antarctic systems. His work has led to major advances in understanding the nature, complexity and diversity of Antarctic life, and the threats posed to it from environmental change. He has revolutionised the way in which information on the environmental responses of animals is understood at global scales, unveiling not only the nature of adaptation, but also the way in which its limits constitute problems for life in changing circumstances. Chown is regarded as a leader in science policy and conservation policy for the Antarctic.