Tests of Lorentz and CPT symmetry using two-fermion atoms

Lorentz and CPT symmetry are foundational properties of both Special and General Relativity and are key features of our best existing physical theories. Tiny deviations from exact symmetry offer potential signals from the expected unified theory combining quantum physics and gravity. In this talk, I will discuss the prospects for studying signals for Lorentz and CPT violation using spectroscopic experiments with two-fermion atoms.