The Hewlett Foundation’s Education Program is committed to openness and transparency in its grantmaking. Recently, the Program revisited its Open Educational Resources (OER) strategy in an effort to better understand how its philanthropic investments—within the context of the larger funding landscape—can help integrate OER into mainstream education. We conducted dozens of expert interviews and commissioned new research and analysis. The result of our research is this white paper, which presents a roadmap for transforming teaching and learning by shifting OER from a small-scale movement to standard education practice.