ExxonMobil is the split-off or merger of 2 companies. So the creator of Exxon Mobil was John D. Rockefeller who created The Standard Oil company. A journalist wrote a book about the tactics used by Mr. Rockefeller to corner the market on oil and the company was subsequently broken up into 34 smaller companies. This story sounds similar to AT&T. Well there’s more history and story to read here…just click the link and read about ExxonMobil.