Galaxy Growth: The Impact of Neighbors on Galaxy Evolution

Galaxies prefer to live near each other in groups and clusters. I will describe how these environments impacts the growth and evolution of galaxies using new results from a neutral gas survey with the Arecibo telescope and the Sloan Digital Sky Survey. These data show that more massive galaxies live at the centers of groups and are largely devoid of atomic gas, having lost it during their journey through the group and via interactions, or via consumption by star formation.