Martin Rees, Baron Rees of Ludlow, OM, Kt, FRS is a Fellow of Trinity College and Emeritus Professor of Cosmology and Astrophysics at the University of Cambridge. His decorated career in science, covering topics as diverse as black holes and the development of ‘multiverse’ theory, led to his elevation to a life peerage in the House of Lords, where he sits as a crossbencher. He holds the honorary title of Astronomer Royal, as well as being a visiting Professor at Imperial College, London and Leicester University. Lord Martin is the Chair of the Longitude Committee.