The dramatically increasing number of international students at University of California (UC) campuses has had a marked effect on its campus writing centers, causing a reconsideration of personnel, pedagogy, training, services, and cross-campus partnerships. In this article, writing center administrators and staff at 3 UC campuses--UC Irvine, UCLA, and UC San Diego--discuss the challenges they are encountering and the possibilities that are emerging as they pursue their mission to serve all undergraduate student writers.