A think tank, or policy institute, is a research institute that performs research and advocacy concerning topics such as social policy, political strategy, economics, military, technology, and culture. Most think tanks are non-governmental organizations, but some are semi-autonomous agencies within government, and some are associated with particular political parties, businesses or the military. Think tanks are often funded by individual donations, with many also accepting government grants.

Robert Somers Brookings was an American businessman and philanthropist, known for his involvement with Washington University in St. Louis and his founding of the Brookings Institution.