Oscar Lewis, born Lefkowitz (December 25, 1914 – December 16, 1970) was an American anthropologist. He is best known for his vivid depictions of the lives of slum dwellers and his argument that a cross-generational culture of poverty transcends national boundaries. Lewis contended that the cultural similarities occurred because they were "common adaptations to common problems" and that "the culture of poverty is both an adaptation and a reaction of the poor classes to their marginal position in a class-stratified, highly individualistic, capitalistic society."