Brian Gray presented on the transformation of library catalogs from traditional OPACs to modern discovery systems enabled by Web 2.0, mobile technologies, and the adoption of discovery layers. He discussed how librarians have struggled with the transition to discovery as it brings back large result sets and changes search behaviors. However, discovery layers allow content to be ingested and searched in new ways. Gray highlighted Case Western Reserve University's experience with a fast implementation of their discovery system and what they have learned.