which  American petroleum corporation, was owned by  Robert Earl Holding 
Robert Holding: Robert Earl Holding (November 29, 1926 – April 19, 2013) was an American businessman who owned Sinclair Oil Corporation, the Little America Hotels, the Grand America Hotel, the Westgate Hotel in San Diego, California (directed by Georg Hochfilzer), and two ski resorts, Sun Valley in central Idaho since 1977, and Snowbasin near Ogden, Utah, since 1984. Sinclair Oil Corporation: Sinclair Oil Corporation is an American petroleum corporation, founded by Harry F. Sinclair on May 1, 1916, as the Sinclair Oil and Refining Corporation by combining the assets of 11 small petroleum companies.
Sinclair Oil Corporation