Stephan Johannes Klasen (June 18, 1966 - October 27, 2020[1]) was a German development economist and professor of economics at Georg August University in Göttingen.[1] He was also director of the Ibero-America Institute for Economic Research and founder of the Courant Research Center "Poverty, Inequality, and Growth in Developing and Transition Countries".[1] He was a member of the UN Committee on Development Policy, president of the European Development Research Network, and a member of the Intergovernmental Panel on Climate Change for the 5th Assessment Report.[1]