Immanuel Maurice Wallerstein was an American sociologist and economic historian. He is perhaps best known for his development in sociology of world-systems approach. He was a Senior Research Scholar at Yale University from 2000 until his death in 2019, and published bimonthly syndicated commentaries through Agence Global on world affairs from October 1998 to July 2019.

World-systems theory is a multidisciplinary approach to world history and social change which emphasizes the world-system as the primary unit of social analysis. World-systems theorists argue that their theory explains the rise and fall of states, income inequality, social unrest, and imperialism.