VIATCHESLAV MUKHANOV is Professor of Physics at Ludwig-Maximilians-University, Munich. His main result is the theory of inflationary cosmological perturbations. Professor Mukhanov is author of Physical Foundations of Cosmology (Cambridge University Press, 2005). He also serves on the editorial boards of leading research journals and is Scientific Director of the Journal of Cosmology and Astroparticle Physics (JCAP). SERGEI WINITZKI is Research Associate in the Department of Physics at Ludwig-Maximilians-University, Munich. His main areas of research include quantum cosmology, the theory of dark energy, the global structure of spacetime, and quantum gravity.