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I am a theoretical physicist working on topics at the intersection of early-Universe cosmology and particle physics, which together form the field of particle cosmology. I am interested in all aspects of particle cosmology, including topics such as cosmic inflation, reheating, cosmological perturbations, primordial magnetic fields, primordial black holes, cosmological phase transitions, cosmic defects, baryogenesis, leptogenesis, and dark matter. A particular focus of my work is on gravitational waves from the early Universe, especially from exotic sources in the early Universe such as cosmic strings and axion inflation. I am also involved in the search for a gravitational-wave background with pulsar timing array (PTA) observations. I am specifically a member of the NANOGrav (North American Nanohertz Observatory for Gravitational Waves) collaboration, in the context of which I act as a Co-Chair of the NANOGrav New Physics Working Group (NPWG). As a NANOGrav and NPWG member, I am interested in all effects that new particle physics and new gravitational physics can have on PTA data, that is, all ways in which we can probe new physics at the PTA frontier, including gravitational waves from the early Universe, dark matter in the Milky Way, and modified gravity.