Mr. Ellis was elected to the Board in 2017 and was appointed Non-Executive Chairman of the Board in February 2020. He served as a director and President and Chief Executive Officer of Linn Energy, Inc., the reorganized successor to Linn Energy, LLC (“LINN”), which filed for bankruptcy in the federal bankruptcy court, Southern District of Texas, in May 2016. From January 2010 until his retirement from LINN in August 2018, Mr. Ellis was the President and Chief Executive Officer and a director of LINN. From 2012 until August 2018, Mr. Ellis also served as Chairman of LINN’s board of directors. Prior to joining LINN in 2006, Mr. Ellis served in varying roles of increasing responsibility for Burlington Resources and ConocoPhillips. Mr. Ellis holds a B.S. in Petroleum Engineering from Texas A&M University.
Mr. Brookman, the Company’s President and Chief Executive Officer (“CEO”), was appointed to the Board in January 2015, simultaneously with his appointment as the Company’s CEO. Mr. Brookman joined the Company in July 2005 as Senior Vice President—Exploration and Production; he was appointed to the position of Executive Vice President and Chief Operating Officer in June 2013 and then served as President and Chief Operating Officer from June 2014 through December 2014. Prior to joining PDC, Mr. Brookman worked for Patina Oil and Gas and its predecessor Snyder Oil from 1988 until 2005 in a series of operational and technical positions of increasing responsibility, ending his service at Patina as Vice President of Operations. Mr. Brookman holds a B.S. in Petroleum Engineering from the Colorado School of Mines and a M.S. in Finance from the University of Colorado.
Mr. Crisafio, a CPA and a NACD Board Leadership Fellow, joined the Board in 2006. Mr. Crisafio has served as an independent business consultant for more than 20 years, providing financial and operational advice to businesses in a variety of industries, including the oil and gas industry. Through his consulting practice, he has served as the part-time contract Chief Financial Officer for a number of companies in the past five years, including Empire Energy, LLC, MDS Associated Companies such as MDS Energy Development and TruFoodMfg. Mr. Crisafio served as Chief Operating Officer, Treasurer and member of the Board of Directors of Cinema World, Inc. from 1989 until 1993. From 1975 until 1989, he was employed by Ernst & Young LLP, last serving as a partner from 1986 to 1989. He was responsible for several SEC registered client engagements and a number of privately held oil and gas engagements, gaining significant experience with the oil and gas industry and mergers and acquisitions. Mr. Crisafio holds a B.S. from Duquesne University.
Ms. Ibrahim joined the Board in January 2018. She formerly served as the Executive Vice President, General Counsel and Chief Compliance Officer of Weatherford International plc (“Weatherford”), a position she held since May 2015 to June 2020. Weatherford filed for bankruptcy in federal bankruptcy court, Southern District of Texas, in July 2019. Ms. Ibrahim has more than 20 years of experience in the oil and gas services industry. Prior to joining Weatherford in 2015, Ms. Ibrahim held a number of senior leadership positions of increasing responsibility in the legal department of Halliburton Company since joining in November 1997, including, most recently, as Vice President, Chief Commercial Counsel and Corporate Secretary with responsibility for the global procurement, employment and real estate practice groups and oversight of mergers and acquisitions, securities, regulatory and governance practice groups. Ms. Ibrahim also served as General Counsel and Chief Compliance Officer for WellDynamics, a Halliburton joint venture company. Ms. Ibrahim holds a B.S. in Business Management and Finance from Virginia Tech and a J.D. from Texas Southern University.
Mr. Korus joined the Board in January 2020 in connection with the closing of the merger with SRC Energy Inc. (“SRC”). Mr. Korus was previously the Senior Vice President and Chief Financial Officer of Cimarex Energy Co. from September 2002 until his retirement in 2015, and held the same positions with its predecessor, Key Production Company, from 1999 through 2002. Mr. Korus has been a director of Whiting Petroleum since September 2020 and a director of Antero Resources Corporation since December of 2018. He was a member of the board of directors of SRC from June 2016 until January 2020. Mr. Korus was also a director of Antero Midstream Partners LP from January 2019 until its merger with Antero Midstream GP LP in March 2019. His previous experience also includes approximately five years as an oil and gas research analyst at an investment banking firm. He began his oil and gas career in 1982 with Apache Corporation where he held positions in corporate planning, information technology and investor relations. From 2011 to 2019, Mr. Korus served on the UND College of Business and Public Administration Alumni Advisory Council and was its chairperson from 2017 to 2019. Mr. Korus is a former CPA. Mr. Korus holds a B.S. in Economics and M.S. in Accounting from the University of North Dakota.
Mr. Nickerson joined the Board in March 2017. From December 2015 to March 2017, Mr. Nickerson served as the Executive Vice President, Corporate Strategy of Marathon Petroleum Corporation and as the Executive Vice President and Chief Commercial Officer of the MarkWest assets of MPLX GP LLC. Prior to joining Marathon Petroleum Corporation, Mr. Nickerson served in various capacities of increasing responsibility for MarkWest Energy Partners, L.P. and its predecessor, including most recently as its Senior Vice President, Corporate Development and Chief Commercial Officer from 2006 until December 2015. Mr. Nickerson has extensive experience in leading the development and operation of midstream infrastructure. Mr. Nickerson holds a B.S. in Chemical Engineering from Colorado State University.
Mr. Parke, who joined the Board in 2003, has over 30 years of investment banking experience. He has served as a Managing Director of Gordian Investments LLC since October 2014. He has also been a member of the Life Science Advisory Group of IP Group plc since July 2018. From June 2011 until October 2014, he was a Managing Director in the investment banking group of Burrill Securities LLC, an investment banking firm. From 2006 until June 2011, he was a Managing Director of Boenning & Scattergood, Inc., a regional investment bank. Prior to joining Boenning & Scattergood, from October 2003 to November 2006, he was a Director with the investment banking firm Mufson Howe Hunter & Company LLC. From 1992 through 2003, Mr. Parke was Director of Corporate Finance of Investec, Inc. and its predecessor, Pennsylvania Merchant Group Ltd., both investment banking companies. Prior to joining Pennsylvania Merchant Group, Mr. Parke served in the corporate finance departments of Wheat First Butcher & Singer, now part of Wells Fargo, and Legg Mason, Inc., now part of Stifel Nicolaus. Mr. Parke holds a B.S. in Finance from Lehigh University and an M.B.A. from the Wharton School at the University of Pennsylvania.
Mr. Peterson joined the Board in January 2020 in connection with the closing of the merger with SRC. He was the Chairman of the Board, Chief Executive Officer and President of SRC from May 2015 until January 2020. He was a co-founder of Kodiak Oil & Gas Corporation (“Kodiak”), and served Kodiak as a director (2001-2014) and as its President, Chief Executive Officer (2002-2014) and Chairman of the Board (2011-2014) until its acquisition by Whiting Petroleum Corporation in December 2014. Mr. Peterson served as a director of Whiting Petroleum Corporation (“Whiting”) from December 2014 to June 2015 and was appointed President, Chief Executive Officer and director of Whiting in September 2020. Mr. Peterson was also a member of the board of directors of Denbury Resources Inc. from May 2017 until September 2020. Mr. Peterson has over 35 years of industry experience. Mr. Peterson holds a B.S. in Accounting from Northern Colorado University.