Another notable journalist is Nicholas Lemann who published a handful of articles on the underclass in the "Atlantic Monthly" during the late 1980s and early 1990s. His 1986 writings on "The Origins of the Underclass" argue that the underclass was created by two migrations, the great migration of Southern blacks to the North and West during the early to mid twentieth century and the exodus of middle class blacks out of the ghetto during the 1970s through the early 90s. In 1991 Lemann also published an article titled "The Other Underclass", which details Puerto Ricans, and particularly Puerto Ricans residing in South Bronx, as members of the urban underclass in the US.