Michael Strauss is interested in all aspects of extragalactic astronomy and observational cosmology, especially in the context of wide-field imaging and spectroscopic surveys of the sky. He has used large surveys including IRAS and the Sloan Digital Sky Survey, to study the large-scale distribution of galaxies to constrain cosmological parameters, the relationship between galaxy properties and their environment, and the nature and evolution of AGN and quasars at large redshifts. He is now using data from the Hyper Suprime-Cam on the Subaru Telescope to search for distant quasars and study the properties of the galaxies in which they live. He is involved in planning for the next generation of large surveys, including the Prime Focus Spectrograph on Subaru and the Rubin Observatory Legacy Survey of Space and Time.