The HathiTrust Research Center is seeking proposals for Advanced Collaborative Support (ACS) projects. ACS is a newly launched scholarly service at the HTRC offering collaboration between external scholars and HTRC staff to solve challenging problems related to HTRC tools and services. By working together with scholars, we facilitate computational access to HathiTrust Research Center digital tools (HTRC) as well as the HathiTrust (HT) digital library based on individual scholarly need. This Advanced Collaborative Support (ACS) will drive innovation at the scholar’s digital workbench for enhancing and developing new techniques for use within the HTRC platform.