Pedro G. Ferreira is Professor of Astrophysics at the University of Oxford. He studied and worked at Imperial College in London, at the University of California at Berkeley and at CERN in Geneva. He has held visiting positions at University of Edinburgh, at the Albert Einstein Institute in Berlin and at Columbia University in New York. His area of expertise is cosmology where he has pioneered research in the relic radiation left over from the Big Bang, the nature of the dark Universe (such as dark matter and dark energy) and alternatives to Einstein’s theory of General Relativity. More recently he has worked on gravitational waves and modern statistical methods for studying the large scale structure of the Universe. Pedro G. Ferreira has written extensively outside academia, writing for Nature, Science, New Scientist, Physics World, Physics Today, Scientific American, Sky at Night, CERN Courier, BBC Focus, The Guardian. His most recent book, “The Perfect Theory: A Century of Geniuses and the Battle over General Relativity” has been published in over 20 countries and was shortlisted for the 2014 Royal Society Winton Science Book Prize.