SLAC, Building 048, Madrone Conf. Room, Room 224
Galaxy clusters, as the largest peaks in the cosmic density field, play an important role in astrophysics and cosmology. As the most dramatic features of large-scale structure, the abundance of clusters provides a key opportunity to test our understanding of structure formation and cosmic expansion history. In recent years, observational astrophysics has been revolutionized by large surveys, yielding large optical cluster catalogs allowing for precision tracking of the growth of structure.