I am an Emmy Noether Research Group Leader at the Astronomisches Rechen-Institut (ARI) at Heidelberg University with scientific expertise in stellar atmospheres, in particular for hot and massive stars. During my PhD at the University of Potsdam in Germany, I discovered my passion for Wolf-Rayet and other evolved stars. I am an active developer of PoWR, a leading code in simulating the complex atmospheres of hot stars with radiatively driven winds. Located at the conjunction of theory and observations, I use my atmosphere models to quantify the physical properties of massive stars and their winds. This includes the analysis of observations from modern, large-scale telescopes as well as providing predictions for mass-loss rates, stellar spectra and feedback, crucial ingredients to better understand stellar populations and the origin of massive black holes and gravitational waves.