Stefan Ohm has been a highly valued and active contributor to H.E.S.S. data analysis, simulations and astrophysics since 2007, working at the Max Planck Institute for Nuclear Physics in Heidelberg, the University of Leicester, and since 2014 at DESY Zeuthen. Stefan’s many contributions include improvements to the techniques for background rejection, improvements to the real time science data analysis for H.E.S.S. and gamma-ray studies of many systems involving massive stars and/or star-forming regions.