The Kavli Institute for Cosmology Cambridge and Institute of Astronomy hosted a symposium from 1–3 September 2015 to coincide with the 60th birthday of Professor George Efstathiou, Director of KICC, and to celebrate George's many significant contributions to astrophysics and cosmology. The programme covered many of George's scientific interests including dark matter and dark energy, galaxy surveys, galaxy formation, cosmic dawn, cosmic microwave background, and early-universe cosmology.