John Gribbin gained a PhD from the Institute of Astronomy in Cambridge before working as a science journalist for Nature and later New Scientist. John has written many bestselling popular science books, including In Search of the Multiverse and The Universe: A Biography. Mary Gribbin is a teacher with a special gift for communicating difficult concepts, and she is a previous winner of the TES Junior Information Book Award. John and Mary are both Visiting Fellows at the University of Sussex. They have co-written several titles, including Out of the Shadow of a Giant.