Tilman Spohn is director of the Institute of Planetary Research of the German Aerospace Center (DLR) in Berlin, Germany and Professor of Planetology at theWestfa¨lische Wilhelms-University Mu¨nster, Germany. He specializes in the Thermodynamics of Planetary Interiors and in physical problems of Astrobiology and has written 140 papers for scientific journals and books. He is a Principal Investigator (PI) for MUPUS on the Rosetta Lander Philae, for BELA on BepiColombo, and the instrument PI for HP3 on the InSight mission. Spohn has served as member and chairperson of ESA scientific working and advisory groups and is presently a member of ESA’s HISPAC. He is the chairman of the science committee of the international Space Science Institute and has served as editor for Earth and Planetary Science Letters, Reviews of Geophysics, and the Treatise on Geophysics. He is the recipient of the 2013 EGU Runcorn-Florensky Medal and a fellow of the American Geophysical Union.