What role might librarians play in building the 21st Century research university? How can librarians effectively assess the impact of the expertise, services, and resources they deliver to the academic community? In this issue brief, Anne Kenney, the Carl A. Kroch University Librarian at Cornell University, explores how librarians can leverage the liaison model to demonstrate “that the library is more than a purveyor of content and that its expertise is an essential component of the academic knowledge infrastructure on and off campus.”