Harold Hamm
The Continental Towers in Enid, Oklahoma. Harold Glenn Hamm (born December 11, 1945) is an American entrepreneur primarily involved in the oil and gas business who is best known for pioneering the development of the large shale oil resources of the Bakken formation. On January 16, 2015 Hamm was ranked by Forbes magazine as the 48th richest person in United States and 132nd richest person in the world, with a net worth estimated at $9.3 billion, which decreased from $18.7 billion in late 2014. In 2012 presidential candidate Mitt Romney named Hamm as his energy advisor and thereafter Hamm made substantial monetary and advisory contributions to the election effort.