The University of California High-Performance AstroComputing Center (UC-HiPACC), based at the University of California, Santa Cruz, is a consortium of the University of California campuses and three Department of Energy laboratories: Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and Los Alamos National Laboratory. UC-HiPACC supports or co-sponsors activities in computational astronomy to further collaborations in fundamental research. It also raises awareness of computational astronomy through education and public outreach, especially the pioneering research throughout the UC system. UC-HiPACC was founded in January 2010 with a five-year grant from the University of California. This report summarizes the Center’s principal programs, activities, and achievements during its first three years, 2010–2012, as well as some looks ahead for 2013.