William Archibald Dunning was an American historian and political scientist at Columbia University noted for his work on the Reconstruction era of the United States. He founded the informal Dunning School of interpreting the Reconstruction era through his own writings and the Ph.D. dissertations of his numerous students. Dunning has been criticized for advocating white supremacist interpretations, his "blatant use of the discipline of history for reactionary ends" and for offering "scholarly legitimacy to the disenfranchisement of southern blacks and to the Jim Crow system."