David Mark Rubenstein (born August 11, 1949) is an American billionaire businessman. A former government official and lawyer, he is a co-founder and co-chairman of the private equity firm The Carlyle Group, a global private equity investment company based in Washington, D.C. He is chairman of the Kennedy Center for the Performing Arts, chairman of the National Gallery of Art, chairman of the Council on Foreign Relations, and chairman of The Economic Club of Washington, D.C., and former chairman of the Duke University Board of Trustees, and former chairman of the Smithsonian Institution. In 2022, he became chair of the University of Chicago's Board of Trustees. According to Forbes, Rubenstein had a net worth of US$4.3 billion as of October 2021.