The school was named after Columbia University professor William Archibald Dunning (1857–1922), whose writings and those of his PhD students comprised the main elements of the school. He supported the idea that the South had been hurt by Reconstruction and that American values had been trampled by the use of the U.S. Army to control state politics. He contended that freedmen had proved incapable of self-government and thus had made segregation necessary. Dunning believed that allowing blacks to vote and hold office had been "a serious error". As a professor, he taught generations of scholars, many of whom expanded his views of the evils of Reconstruction. The Dunning School and similar historians dominated the version of Reconstruction-era history in textbooks into the 1960s. Their generalized adoption of deprecatory terms such as scalawags for southern white Republicans and carpetbaggers for northerners who worked and settled in the South, have persisted in historical works.