Mr. Leidel serves as a member of the board of directors of Extraction Oil & Gas. Mr. Leidel is a founder and principal of Yorktown Partners LLC, which was established in September 1990. Yorktown Partners LLC is the manager of private investment partnerships that invest in the energy industry. He has been a member of the board of directors of PRE Resources since June 2012 and of Extraction Oil & Gas since its inception. Previously, he was a partner of Dillon, Read & Co. Inc., held corporate treasury positions at Mobil Corporation and worked for KPMG and for the U.S. Patent and Trademark Office. Mr. Leidel is also a director of certain non-public companies in the energy industry in which Yorktown holds equity interests. He holds a BBA degree in accounting from the University of Wisconsin and an MBA from the Wharton School at the University of Pennsylvania.