Lyman Alexander Page Jr. is the James S. McDonnell Distinguished University Professor of Physics at Princeton. He did undergraduate work at Bowdoin College and, from 1978 through 1979, he was a research technician for the Bartol Research Foundation, where he conducted research at McMurdo Sound and the South Pole, in Antarctica. He earned his Ph.D. in physics from the Massachusetts Institute of Technology (MIT) in 1989. His research focuses on measurements of the cosmic microwave background (CMB) from ground based, balloon-borne, and satellite platforms with HEMT amplifiers, SIS mixers, and bolometers. Page is one of the original co-investigators on the WMAP satellite, the founding director of the ACT project, and a founding member of the Simons Observatory. He is the recipient of several awards and honors, including the Breakthrough Prize (2017), the Gruber Prize (2015, 2012), and the Shaw Prize (2010). He is a member of the National Academy of Sciences and Fellow of the American Academy of Arts and Sciences.