On January 2, 2014 the Cleveland Foundation, the first community foundation in the United States, will celebrate its 100th anniversary. A major research project is currently underway to study the history of U.S. community foundations to mark this milestone. There are many challenges to studying the history of community foundations, not the least of which is the need to locate sources of materials. A few of the oldest community foundations have understood their place in the history of U.S. philanthropy and turned their records over to archives and historical societies that are professionally staffed, but most have not. The records of John D. Rockefeller, Sr. and Jr. and Rockefeller philanthropy in the Rockefeller Archive Center (RAC) are an important resource that can help tell the story of the early history of the Cleveland Foundation and the community foundation movement.