In this talk I will review recent progress in tracing galaxy evolution by studies of their globular cluster systems. Globular clusters trace the major star formation episodes in a galaxy, and are relatively robust to galaxy mergers, thus they provide a crucial probe of the star formation and assembly history of galaxies. Being single stellar populations they are much better suited to stellar population analysis (eg ages and chemical properties) than their host galaxies. In this talk, I will review data from the Keck, Gemini and Hubble telescopes. These data will be compared to predictions from galaxy formation models.