W.E.B. Du Bois 
The Souls of Black Folk 

According to Wikipedia: 'William Edward Burghardt Du Bois (February 23, 1868 – August 27, 1963) was an American civil rights activist, public intellectual, Pan-Africanist, professor of sociology, historian, writer, and editor. At the age of 95, in 1963, he became a naturalized citizen of Ghana. David Levering Lewis, a biographer, wrote, 'In the course of his long, turbulent career, W. E. B. Du Bois attempted virtually every possible solution to the problem of twentieth-century racism— scholarship, propaganda, integration, national self-determination, human rights, cultural and economic separatism, politics, international communism, expatriation, third world solidarity.”