Bunche earned a master's degree in political science in 1928 and a doctorate in 1934, while he was already teaching in the Department of Political Science at Howard University, an historically black college. At the time, it was typical for doctoral candidates to start teaching before completion of their dissertations. He was the first African American to gain a PhD in political science from an American university. He published his first book, World View of Race, in 1936. From 1936 to 1938, Ralph Bunche conducted postdoctoral research in anthropology at the London School of Economics (LSE), and later at the University of Cape Town in South Africa.
While teaching at Howard University in 1928, Bunche met Ruth Harris as one of his students. They later started seeing each other and married June 23, 1930. The couple had three children: Joan Harris Bunche (b. 1931), Jane Johnson Bunche (b. 1933), and Ralph J. Bunche, Jr. (b. 1943). His grandson, Ralph J. Bunche III, is the General Secretary of the Unrepresented Nations and Peoples Organization, an international membership organization established to facilitate the voices of unrepresented and marginalised nations and peoples worldwide.