ETA INVESTOR JONATHAN YELLEN JOINS BOARD OF MAMMOTH ENERGY SERVICES, INC



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MAMMOTH ENERGY SERVICES, INC. revealed 8-K form on November 20. Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. In a letter dated November 18, 2019, Paul K. Heerwagen IV, a member of the Board of Directors (the ‘Board’) of Mammoth Energy Services, Inc.…