The John D. and Catherine T. MacArthur Foundation is a major grant-making private foundation based in Chicago that has awarded more than US $4 billion since its inception in 1978.
The John D. and Catherine T. MacArthur Foundation is one of the nation's largest private foundations. Based in Chicago but supporting non-profit organizations that work in 60 countries, MacArthur has awarded more than US $4 billion since its inception in 1978.