It is an American multinational oil and gas company headquartered in Irving, Texas, and is the largest subsidiary of Standard Oil Company founded by John Rockefeller. ExxonMobil (now registered in New Jersey) was established after the merger of Exxon Corporation (which was called Standard Oil Corporation of New Jersey) with Mobil Corporation (which was called Standard Oil Corporation of New York State) on November 30, 1999. The company has several sub-brands, which are companies Exxon, Esso, Mobil, in addition to ExxonMobil Chemical Company.