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Zac Graves serves as the Chief Executive Officer of SEF Energy. Prior to SEF, Zac served as President of several entities within Chesapeake Oilfield Services, the predecessor company to Seventy Seven Energy. Before joining Chesapeake, Zac held the positions of Chief Financial Officer and Executive Vice President of Operations for Bronco Drilling Company, a publicly traded company listed on the Nasdaq. In addition, Zac worked in various capacities in both public and private energy-focused companies controlled by Wexford Capital LP. Zac graduated from the University of Oklahoma with a BBA in Accounting.