Martin Rees is the UK’s Astronomer Royal and a Fellow (and former Master) of Trinity College, Cambridge. After studying at Cambridge, he held post-doctoral positions in the UK and the USA, before becoming a professor at Sussex University, and subsequently moving to Cambridge as professor and (for ten years) Director of the Institute of Astronomy. He has received numerous international awards including the Balzan Prize. the Crafoord Prize (Swedish Academy), the Bower Prize (Franklin Institute) and the Templeton Prize. He is a foreign associate of the US National Academy of Sciences, the Russian Academy of Sciences, the Pontifical Academy, and several other foreign academies. He served during 2005-2010 as President of the Royal Society and in 2005 he was appointed to the UK’s House of Lords. His research focus has been on black holes, cosmology, the ‘multiverse’ and extreme physics in the universe. He has written several general books on cosmology, and also one, Our Final Hour, addressing possible existential threats from advanced technology and environmental degradation. His newest book is On the Future: Prospects for Humanity (Princeton University Press).