The Rockefeller Foundation (RF) began its work on the American-colonized Philippine Islands in 1913. Engaging mainly in health and sanitation work, it built a strong partnership with the American insular government there and continued its charitable work long after Philippine independence in 1946. The author's research at the Rockefeller Archive Center focused on the RF's activities between 1913 and 1935. I looked specifically at its relationship with an increasingly Filipinized government to understand the role non-state actors played in this American colony. In that period the Foundation undertook two major projects previously unstudied by historians: a hospital ship and an overhaul of the public health education system.