Frank McCorkle cut his teeth in the oil fields. The CEO and co-founder of Treadstone Energy Partners began working as a roustabout on his dad’s homemade workover rig in southeastern Kansas at age 11 on Saturdays and holidays, and by age 13, full time in the summers. His father built the rig from an old truck, a tractor engine and piecemealed parts that serviced wells less than 2,000 feet deep. “I didn’t know anything else,” he said. “I had good field experience.”

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