Matias Zaldarriaga is a professor of astrophysics and cosmology at the Institute for Advanced Study. He received his Ph.D from the Massachusetts Institute of Technology in 1998. He has made many influential and creative contributions to our understanding of the early universe, particle astrophysics, and cosmology as a probe of fundamental physics. Much of his work centers on understanding the clues about the earliest moments of our universe encoded in the Cosmic Microwave Background, the faint glow of radiation generated by the Big Bang, and in the distribution of matter in the late universe. Matias received a MacArthur Fellowship in 2006.