Gabrielle Walker has a PhD in natural sciences from Cambridge University and has taught at both Cambridge and Princeton universities. She is Chief Scientist of strategic advisory firm Xyntéo, a consultant to New Scientist, contributes frequently to BBC radio and writes for many newspapers and magazines. In 2009 and 2011 respectively she presented the Planet Earth Under Threat series and Thin Air for BBC Radio 4, and in 2011 she presented The Secret Life of Ice for BBC4. She has just published Antarctica: An Intimate Portrait of the World's Most Mysterious Continent. She lives in London.