A member of the faculty since 1995, Prof. Weinberg studies the large scale structure of the universe, dark energy and dark matter, the formation and evolution of galaxies and quasars, and the intergalactic medium (IGM). He is well-known for his development of “halo occupation” methods to connect observed galaxy clustering to underlying dark matter structure, for theoretical modeling and cosmological applications of the Lyman-alpha forest, and for numerical simulation studies of the mechanisms of galaxy growth. Prof. Weinberg was the Project Spokesperson of SDSS–II and the Project Scientist of SDSS–III; he is also a member of the DES and DESI collaborations and science and infrastructure teams for the Nancy Grace Roman Space Telescope. His work includes a book-length review of Observational Probes of Cosmic Acceleration, examining the methods and prospects for next-generation dark energy experiments. His academic honors include the OSU Distinguished Scholar Award (2006), the Henry L. Cox Professorship (2013-2018), the Berkeley Prize of the American Astronomical Society (2015), the Dannie Heineman Prize for Astrophysics of the American Astronomical Society and the American Institute of Physics (2021), and election to the National Academy of Sciences (2023).  In 2017, David was named a Distinguished University Professor, the highest faculty award at the university.   He has been chair of the Astronomy Department since 2015.