Immanuel Maurice Wallerstein (/ˈwɔːlərstiːn/; September 28, 1930 – August 31, 2019) was an American sociologist and economic historian. He is perhaps best known for his development of the general approach in sociology which led to the emergence of his 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. He was the 13th president of International Sociological Association (1994–1998).