This grant provides three years of support to an ongoing postdoctoral fellowship program administered by the Council on Library and Information Resources (CLIR) that aims both to grow data and software curation capacity within research libraries and to develop the next generation of data and software curators who will bring deep research experience into the organizational context of the university library. Fellows are PhD-level researchers who are selected, in part, for their potential to build collaborative relationships with natural and social scientists across the university. Since the launch of the program in 2012, fellows have been placed at a wide variety of universities, working with scientists and library staff on projects to improve the university’s data and software curation services and responding to requests from researchers to build tools and resources that speak to their needs. Recent participating institutions include UC Berkeley, MIT, Yale, the California Digital Library, Vanderbilt, the Federal Reserve Bank of Kansas City and the U.S. Agency for International Development. Funds from this grant will support the 2018-2020 class of CLIR fellows, which includes a cohort of four software curation fellows as well as four additional data curation fellows in the natural and social sciences. In addition to covering some salary, travel, and professional development support for fellows, grant funds cover operational costs associated with the administration of the program.