Kaiser Permanente is an integrated managed care consortium, based in Oakland, California, United States, founded in 1945 by industrialist Henry J. Kaiser and physician Sidney Garfield. Kaiser Permanente is made up of three distinct groups of entities: the Kaiser Foundation Health Plan and its regional operating subsidiaries; Kaiser Foundation Hospitals; and the autonomous regional Permanente Medical Groups. As of 2006, Kaiser Permanente operates in nine states and the District of Columbia, and is the largest managed care organization in the United States.