I am a researcher in the field of astroparticle physics. I am mainly specialised in phenomenology, theory and code development related to ultra-high-energy cosmic rays, astrophysical neutrinos and cosmogenic photons. I investigate the propagation and origin of these cosmic messengers by connecting numerical simulations to current measurements. I am one of the core developers of CRPropa (crpropa.desy.de), a software framework for the propagation of ultra-high-energy cosmic particles.