James Binney has degrees from the universities of Cambridge and Oxford and has studied in the Albert LudwigsUniversitaet, Freiburg i. Breisgau. After three postdoctoral years in Princeton he joined the Physics faculty atOxford and has there taught courses ranging from first-year mathematical methods, through statistical physics,quantum mechanics, general relativity, group theory and differential geometry and physics. He researches thestructure, formation and dynamics of galaxies. For this work he has received the Maxwell Medal and the DiracMedal from the Institute of Physics, the Dirk Brouwer Award from the American Astronomical Society and theEddington Medal from the Royal Astronomical Society. He was elected a Fellow of the Royal Society in 2000. He isjoint author of Galactic Dynamics (Princeton UP 1987, 2008), Galactic Astronomy (Princeton UP 1998) and TheTheory of Critical Phenomena (Oxford UP 1992).David Skinner obtained his PhD from Oxford Physics and took postdoctoral positions in Oxford Maths, Perimeterand IAS before joining DAMTP, Cambridge. He is interested in quantum field theory, string theory and twistortheory.