Explore neutrino theory and beyond Standard Model (BSM) searches in this 45-minute conference talk by Matheus Hostert from Perimeter Institute. Delve into topics such as the seesaw mechanism, low-scale and low-mass seesaw models, modern experiments, and short baseline anomalies. Examine heavy neutrinos, additional interactions, and various signatures of new physics. Learn about the production of new states, variations in neutrino models, and the Fast Multicolor Generator. Gain insights into the interdisciplinary developments in neutrino physics, including connections to gravitational waves, cosmology, and astrophysics, as part of the Kavli Institute for Theoretical Physics conference on Interdisciplinary Developments in Neutrino Physics.