William Roger Louis CBE FBA (born May 8, 1936), also known as Wm.
Roger Louis or, informally, Roger Louis, is an American historian and a professor at the University of Texas at Austin.
Louis is the editor-in-chief of The Oxford History of the British Empire, a former president of the American Historical Association (AHA), a former chairman of the U.S.
Department of State's Historical Advisory Committee, and a founding director of the AHA's National History Center in Washington, D.