Kirpal "Paul" Nandra is a British physicist and the current director at the Max Planck Institute for Extraterrestrial Physics. He was Professor of Astrophysics and Head of the Astrophysics Group at Imperial College London. He is noted as a member of the X-ray group and studies the astrophysics of extreme environments, specifically those close to black holes in active galactic nuclei. He has written or co-written numerous papers on this topic. Source: Wikipedia (en)