W. E. B. Du Bois (1868–1963) was an American sociologist, historian and civil rights activist. The first African American to earn a doctorate from Harvard, he became a professor of history, sociology and economics at Atlanta University. He rose to national prominence as the leader of the Niagara Movement, a group of African-American activists who wanted equal rights for blacks, and was one of the co-founders of the NAACP in 1909. He wrote one of the first scientific treatises in the field of American sociology, and published three autobiographies. Black Reconstruction in America (1935) challenged the prevailing orthodoxy that blacks were responsible for the failures of the Reconstruction era. On August 28, 1963, a day after his death, his book The Souls of Black Folk was highlighted by Roy Wilkins at the March on Washington, and hundreds of thousands of marchers honored him with a moment of silence. A year later, the Civil Rights Act of 1964, embodying many of the reforms for which he had campaigned his entire life, was enacted. This gelatin silver print of Du Bois was taken in 1907 by the American photographer James E. Purdy, and is in the collection of the National Portrait Gallery in Washington, D.C.Photograph credit: James E. Purdy; restored by Adam Cuerden