The John D. and Catherine T. MacArthur Foundation supports creative people, effective institutions, and influential networks building a more just, verdant, and peaceful world. MacArthur is placing a few big bets that truly significant progress is possible on some of the world’s most pressing social challenges, including over-incarceration, global climate change, nuclear risk, and significantly increasing financial capital for the social sector. In addition to the MacArthur Fellows Program, the Foundation continues its historic commitments to the role of journalism in a responsible and responsive democracy, as well as the strength and vitality of MacArthur’s headquarters city, Chicago.

MacArthur is one of the nation's largest independent foundations. Organizations supported by the Foundation work in about 40 countries. In addition to Chicago, MacArthur has offices in India, Mexico, and Nigeria.