Professor Lord Martin John Rees, Baron Rees of Ludlow, OM, FRS, FREng, FMedSci, FRAS is a world-renowned cosmologist and astrophysicist. He has been Astronomer Royal since 1995 and was Master of Trinity College, University of Cambridge from 2004 to 2012 and President of the Royal Society between 2005 and 2010. He co-founded the Centre for the Study of Existential Risk at University of Cambridge. Lord Rees is the author of several books, most recently: ‘On the Future: Prospects for Humanity’ (2018;) ‘From Here to Infinity: Scientific Horizons’ (2011;) and ‘Our Cosmic Habitat’ (2001.) Lord Rees is the author of more than 500 research papers, and has made contributions to the origin of cosmic microwave background radiation, as well as to galaxy clustering and formation. His studies of the distribution of quasars led to final disproof of Steady State theory. Since the 1990s, Lord Rees has worked on gamma-ray bursts and on how the “cosmic dark ages” ended when the first stars formed. In a more speculative vein, he has, long been interested in anthropic reasoning, and the possibility that our visible universe is part of a vaster “multiverse. He has received the Crafoord Prize for his work understanding the large-scale structure of the Universe and the Balzan Prize for his research into high energy astrophysic. After receiving a knighthood in 1992 for his services to science, he was elevated to the title of Baron Rees of Ludlow in 2005. He holds a Ph.D. from University of Cambridge.