The Organization of American Historians (OAH), formerly known as the Mississippi Valley Historical Association, is the largest professional society dedicated to the teaching and study of American history. OAH's members in the U.S. and abroad include college and university professors; historians, students; precollegiate teachers; archivists, museum curators, and other public historians; and a variety of scholars employed in government and the private sector. The OAH publishes the Journal of American History. Among its various programs, OAH conducts an annual conference each spring, and has a robust speaker bureau—the OAH Distinguished Lectureship Program.

Eugene Campbell Barker was an American historian at the University of Texas, the managing director of the Texas State Historical Association, and the editor of the Southwestern Historical Quarterly. He chaired the history department while soliciting gifts to the university, which he used to build a collection of archives and artifacts. In 1950, the university dedicated the Eugene C. Barker History Center as a repository for his collections. These collections are an important part of the Dolph Briscoe Center for American History at the University of Texas.