Xavier Calmet is a Reader in Theoretical Particle Physics at the University of Sussex. His various research interests are in theoretical physics. He currently works  on the interplay between particle physics and gravity which can be probed using black holes. He is the leader of the working group on quantum black holes of the European COST action "black holes in a violent universe".   Bernard Carr is Professor of Mathematics and Astronomy at Queen Mary, University of London. His area of research is cosmology and relativistic astrophysics and includes such topics as the early universe, black holes, dark matter and the anthropic principle. In 1984 he was awarded the Adams Prize by the University of Cambridge and In 2007 he edited a book entitled "Universe or Multiverse?".    Elizabeth Winstanley is Professor of Mathematical Physics at the University of Sheffield. Her research interests focus on black holes in general relativity and quantum field theory in curved space-time.  She is a past chair of the Gravitational Physics Group of the Institute of Physics in the UK and was the 2010 Australian Institute of Physics Women in Physics Lecturer.