Office of the Comptroller of the Currency - founded in 1863, it is one of the agencies of the Department of the Treasury. The office is headed by the Comptroller of the Currency, and the agency is responsible for administering federal banking laws and supervising the activities of the 4,700 national banks. In addition, the Comptroller directs a staff of 2,100 bank examiners, who investigate to make sure that all the national banks are financially secure and operating well.