Lord Martin Rees is a Fellow of Trinity College and Emeritus Professor of Cosmology and Astrophysics at the University of Cambridge. He holds the honorary title of Astronomer Royal and also Visiting Professor at Imperial College London and at Leicester University. After studying at the University of Cambridge, he held post-doctoral positions in the UK and the USA, before becoming a professor at Sussex University. In 1973, he became a fellow of King’s College and Plumian Professor of Astronomy and Experimental Philosophy at Cambridge (continuing in the latter post until 1991) and served for ten years as director of Cambridge’s Institute of Astronomy. From 1992 to 2003 he was a Royal Society Research Professor, and then from 2004 to 2012, Master of Trinity College. In 2005 he was appointed to the House of Lords, and he was President of the Royal Society for the period 2005-10. He is a foreign associate of the National Academy of Sciences, the American Philosophical Society, and the American Academy of Arts and Sciences, and is an honorary member of the Russian Academy of Sciences, the Pontifical Academy, and several other foreign academies. His awards include the Gold Medal of the Royal Astronomical Society, the Balzan International Prize, the Bruce Medal of the Astronomical Society of the Pacific, the Heineman Prize for Astrophysics (AAS/AIP), the Bower Award for Science of the Franklin Institute, the Cosmology Prize of the Peter Gruber Foundation, the Einstein Award of the World Cultural Council and the Crafoord Prize (Royal Swedish Academy). He has been president of the British Association for the Advancement of Science (1994-95) and the Royal Astronomical Society (1992-94) and a trustee of the British Museum, NESTA, the Kennedy Memorial Trust, the National Museum of Science and Industry,and the Institute for Public Policy Research. He is currently on the Board of the Princeton Institute for Advanced Study, the Cambridge Gates Trust, and has served on many bodies connected with education, space research, arms control and international collaboration in science. He is the author or co-author of more than 500 research papers, mainly on astrophysics and cosmology, as well as eight books (six for general readership), and numerous magazine and newspaper articles on scientific and general subjects. He has broadcast and lectured widely and held various visiting professorships, etc. His main current research interests are: High energy astrophysics — especially gamma ray bursts, galactic nuclei, black hole formation and radiative processes (including gravitational waves), cosmic structure formation and general cosmological issues.