Upon his return to the United States in 1895, he became the first black person ever to receive a Ph.D. from Harvard, and his doctoral thesis, the suppression of the African Slave-Trade to the United States of America, 1638-1870, was published in the Harvard Historical Monograph Series (Mueller, 1993). From that time, he settled in a very successful career as an educationist and author, while still being very active in championing black rights especially on political, social, and economical fronts. His academics writings include The Souls of Black Folk, The Philadelphia Negro, and many monographs, essays, memoirs, poems, novels, and plays, that he wrote about his life, political beliefs, black identity, call for an end to racial discrimination, and various issues affecting the black people (Mueller, 1993). Through his activism, he was very instrumental in the formation of the Niagara Movement and the National Association for the Advancement of Colored People (NAACP), which was instrumental in organizing a successful protest against racial discrimination of the black people and advocating for civil and political rights of the African Americans.