Reinhard Meinel is a Professor of Theoretical Physics at the Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universitat, Jena, Germany. His research is in the field of gravitational theory, focusing on astrophysical applications. Marcus Ansorg is a Researcher at the Max-Planck-Institut fur Gravitationsphysik, Potsdam, Germany, where his research focuses on the application of spectral methods for producing highly accurate solutions to Einstein's field equations. Andreas Kleinwachter is a Researcher at the Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universitat. His current research is on analytical and numerical methods for solving the axisymmetric and stationary equations of general relativity. Gernot Neugebauer is a Professor Emeritus at the Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universitat. His research deals with Einstein's theory of gravitation, soliton theory, and thermodynamics. David Petroff is a Researcher at the Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universitat. His research is on stationary black holes and neutron stars, making use of analytical approximations and numerical methods.