ABSTRACT:
Two of the most striking features of the cosmic landscape at late times include the buildup of the quiescent galaxy population and the growth of large scale structure in the form of groups and clusters. One of the goals of the Carnegie-Spitzer-IMACS (CSI) redshift survey is to study the connection between these two. I will discuss the strengths of CSI compared to other spectroscopic redshift surveys in addressing these issues and then cover some recent results, including a direct calibration of the stellar mass-halo mass relation for groups out to z~1. Applying this calibration to our group catalog, I will then discuss the evolution in the stellar mass density of the universe for galaxies in the field and in group halos. With this galaxy census, we will therefore learn about the contribution of groups to the buildup of quiescent galaxies.