We are a group of astrophysicists at Caltech who study stars and galaxies with some of the world’s greatest telescopes. Galactic archaeology is the common theme that unifies our research. We study the compositions and motions of stars presently in our Galaxy and in other galaxies in order to learn about those galaxies’ histories. We measure the amounts of elements and isotopes in stars to infer properties of the supernovae that exploded to produce them. We measure the motions of stars to learn about the structure of galaxies and the nature of dark matter.