Fracking pioneer Harold Hamm founded and chairs Continental Resources, one of the nation's biggest independent oil companies.
The 13th child of Oklahoma sharecroppers, he picked cotton barefoot as a child and started working at a gas station at age 16 to support his family.
He eventually started his own trucking company hauling water to and from oilfields, then in 1971 took out a loan to drill his first well.
In the 1990s he had the vision to use horizontal drilling and hydraulic fracturing in North Dakota's Bakken region, transforming the US oil industry.
Today Continental produces more than 160,000 barrels per day, much of it from North Dakota. Hamm and his 5 children together own about 80% of the company.
When Hamm divorced his wife of 26 years in late 2014, he wrote her a settlement check for nearly $975 million.
Hamm served as an informal energy advisor to former President Donald Trump and spoke on Trump's behalf at the 2016 Republican National Convention.
In Their Own Words
I see these people who spring out of nowhere with a new app that they're selling for a billion dollars. How good is that! That's fantastic! That's what it should all be about. There shouldn't be any limits.
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