Hans Rabus graduated in physics in 1989 and obtained a PhD in physics in 1992 at the Freie Universität Berlin. He joined PTB, Germany’s National Metrology Institute, in 1992 as a staff researcher in the field of synchrotron radiation metrology where he developed calorimetric and semiconductor-based detector standards for ultraviolet (UV) and vacuum UV radiation . In 2000 he took the lead of the new working group “detector-based optical radiometry” and organised the first international key comparison of UV spectral responsivity. From 2002-2005 he acted as secretary of the UV working group within the Consultative Committee for Photometry and Radiometry of the Meter Convention. Changing to ionizing radiation metrology in 2005, he chaired the department “fundamentals of dosimetry” from 2009 to 2020, pursuing research on cross-section measurements, nanodosimetry, track structure simulation and ion microbeam-based radiobiology. He coordinated the European project “BioQuaRT” that featured a synergistic approach to metrology of radiation effects encompassing micro- and nanodosimetry, radiochemistry and -biology and multi-scale modelling. From 2012-2018 he was leader of the task “computational micro- and nanodosimetry” within EURADOS WG6 and became chair of WG6 in 2018. Since 2020 Hans is in charge of the field “simulation and artificial intelligence in medicine” and is coordinating PTB’s programme “metrology for artificial intelligence in medicine (M4AIM)”.