Jack in the Box is an American fast-food restaurant chain founded February 21, 1951 by Robert O. Peterson in San Diego, California, where it is headquartered. The chain has 2,200 locations, primarily serving the West Coast of the United States. Food items include a variety of hamburger and cheeseburger sandwiches along with selections of internationally themed foods such as tacos and egg rolls. The company also operates the Qdoba Mexican Grill chain.