Landau’s theory of Fermi liquids is a cornerstone of theoretical physics. I will show how to formulate Fermi liquid theory as an effective field theory of bosonic degrees of freedom, using the formalism of coadjoint orbits. While at the linear level, this theory reduces to existing multidimensional bosonization approaches, it necessarily features nonlinear corrections that are fixed by the geometry of the Fermi surface. These are crucial to reproduce nonlinear response, such as higher-point functions of currents or densities. The effective field theory framework furthermore systematically parametrizes corrections to Fermi liquid behavior, and provides a new angle to approach non-Fermi liquids. (Based on https://arxiv.org/abs/2203.05004).