Title: Globular Cluster Sub-Populations and Galaxy Assembly Jean Brodie University of California, Santa Cruz Abstract: Globular clusters are excellent tracers of the major star forming episodes in a galaxy's history. Studies of the sub-populations in extragalactic globular cluster systems are providing important constraints on the dominant mechanisms and epochs of galaxy assembly. I will discuss current ideas on globular cluster/galaxy formation in the light of recent results from HST and Keck observing programs.