Board of Directors

Julie H. Edwards

Julie H. Edwards

Director since 2006; designated lead director July 2019
Ms. Edwards served as Senior Vice President of Corporate Development of Southern Union Company from November 2006 to January 2007, and immediately prior to that served as its Senior Vice President and Chief Financial Officer from July 2005 to November 2006. Southern Union is primarily engaged in the transportation and distribution of natural gas. Prior to joining Southern Union, Ms. Edwards served as Executive Vice President—Finance and Administration and Chief Financial Officer for Frontier Oil Corporation in Houston from 2000 until July 2005. She joined Frontier Oil in 1991 as Vice President— Secretary and Treasurer after serving as Vice President of Corporate Finance for Smith Barney, Harris, Upham & Co., Inc., New York and Houston, from 1988 to 1991, after joining the company as an associate in 1985. Ms. Edwards has not held a principal employment since retiring from Southern Union in 2007. Ms. Edwards is also a director of ONEOK, Inc., and served as a director of ONEOK Partners GP, L.L.C. until its acquisition by ONEOK, Inc. in June 2017. Ms. Edwards served as a director of the NATCO Group, Inc. from 2004 until its merger with Cameron International Corporation in 2009. Ms. Edwards brings to our Board experience in finance and senior management positions for multiple energy companies and experience as a director of several public companies.
Gordon T. Hall

Gordon T. Hall

Director since 2009
Mr. Hall serves as Chairman of the Board of Archrock, Inc., a natural gas compression services company. At predecessor companies to Archrock, Inc., Mr. Hall served as Vice Chairman of the Board and Lead Independent Director (2013-2015) and as Chairman of the Board (2007-2013) of Exterran Holdings, Inc., and as Chairman of the Board (2005-2007) of Hanover Compressor Company. Mr. Hall is also a professor in the Master of Science in Financial Analysis program at Gordon College and served as the interim Chief Financial Officer of the College for four months during 2018. Mr. Hall retired as Managing Director from Credit Suisse, a brokerage services and investment banking firm, where he was employed from 1987 through 2002. While at Credit Suisse, Mr. Hall served as Senior Oil Field Services Analyst and Co-Head of the Global Energy Group. Mr. Hall was a director of Hydril Company, an oil and gas service company specializing in pressure control equipment and premium connections for tubing and casing, until its merger with Tenaris S.A. in May 2007 and was a director of Grant Prideco, Inc., a drilling technology and manufacturing company, until its acquisition by National Oilwell Varco, Inc. in April 2008. He has also served as a director of multiple private companies. Mr. Hall brings to our Board financial and analytical expertise and investment banking experience, with a focus on the energy sector, and experience as a director with board leadership roles for multiple companies.
Roger Jenkins

Roger W. Jenkins

Director since 2018
Mr. Jenkins has served as the President and Chief Executive Officer and a member of the Board of Directors of Murphy Oil Corporation, an exploration and production company, since 2013. Mr. Jenkins joined Murphy Oil in 2001 and has served in various roles at Murphy Oil, including Chief Operating Officer and President of Murphy Oil’s exploration and production company. Mr. Jenkins also serves on the boards of the American Petroleum Institute and the LSU Foundation and is a member of the National Petroleum Council. Mr. Jenkins brings to our Board experience and knowledge gained as an executive officer in the energy industry, particularly executive officer experience at an exploration and production company that has offshore and onshore producing assets and uses offshore drilling services.
Scott D. Josey

Scott D. Josey

Director since 2014
Mr. Josey is the chairman, chief executive officer and president of Sequitur Energy Resources, LLC, which acquires and develops oil and gas assets in the continental United States, and served as the chairman of the board and chief executive officer of Mariner Energy from August 2001 until November 2010, when it merged with Apache Corporation. Previously, he served as vice president of Enron North America and co-managed its Energy Capital Resources group, provided investment banking services to the oil and gas industry and portfolio management services to institutional investors as a co-founder of Sagestone Capital Partners, and was a director with Enron Capital & Trade Resources Corp. in its energy investment group. From 1982 to 1993, he worked in all phases of drilling, production, pipeline, corporate planning and commercial activities at Texas Oil and Gas Corp. He previously served on the boards of Apache Corporation and Northern Tier Energy GP, LLC. Mr. Josey brings to our Board experience and knowledge gained as an executive officer in the energy industry, investment banking experience, with a focus on the energy sector, and experience as a director of multiple public energy companies.
Jon A. Marshall

Jon A. Marshall

Director since 2009
Mr. Marshall served as President and Chief Operating Officer of Transocean Inc. from November 2007 to May 2008, and immediately prior to that served as Chief Executive Officer of GlobalSantaFe Corporation from May 2003 until November 2007, when GlobalSantaFe merged with Transocean. Transocean is an offshore drilling contractor. Mr. Marshall has not held a principal employment since leaving his position with Transocean. Mr. Marshall also serves as a director of two nonprofit organizations. Mr. Marshall brings to our Board experience in executive positions and experience as a director for diverse, energy-related public companies.
Kevin S. Corbett

Kevin S. Corbett

Director since 2020
Mr. Corbett has served as Chief Executive Officer of the Oklahoma Health Care Authority, Oklahoma’s Medicaid agency, since August 2019. Prior to that time, Mr. Corbett served as a senior partner and risk advisory practice leader with Ernst & Young LLP, where he was employed from 2002 until retiring in June 2017, advising energy sector clients on strategy, operations, finance, risk management, and governance matters. From 1979 to 2002, he held roles of increasing responsibility at Arthur Andersen LLP, most recently as Audit Partner, where he was responsible for energy and financial services clients. Mr. Corbett is a CPA licensed in Oklahoma and Texas and is a member of the National Association of Corporate Directors and American Institute of Certified Public Accountants. Mr. Corbett serves on the boards of several private companies and non-profit organizations, including Midfirst Bank, OU Medicine, Inc., OSU Medical Authority and Trust, and University Hospitals Authority and Trust. Mr. Corbett brings to our Board extensive accounting and financial experience, as well as strong industry knowledge gained from advising clients in the oil and gas industry.
Julie J. Robertson

Julie J. Robertson

Director since 2017
Julie J. Robertson was named executive Chairman of the Board in May 2020. Previously, Ms. Robertson served as Chairman of the Board, President and Chief Executive Officer of the Company from January 2018 until assuming her position as executive Chairman. Ms. Robertson served as Executive Vice President of the Company from February 2006 and as Senior Vice President - Administration from July 2001 to February 2006. Ms. Robertson also served continuously as Corporate Secretary of the Company from December 1993 until assuming the Chairman’s role in 2018. Ms. Robertson has also served as Vice President - Administration of Noble Drilling from 1996 to July 2001 and as Vice President - Administration of Noble Drilling Services Inc beginning in 1994. From 1989 to 1994, Ms. Robertson served consecutively as Manager of Benefits and Director of Human Resources for Noble Drilling Services Inc. Prior to 1989, Ms. Robertson served consecutively in the positions of Risk and Benefits Manager and Marketing Services Coordinator for a predecessor subsidiary of Noble, beginning in 1979. In December 2018, Ms. Robertson joined the board of directors of EOG Resources, Inc., a public oil and natural gas exploration and production company. Ms. Robertson brings to our Board extensive experience in senior management positions in the offshore drilling sector and knowledge of the Company and the industry by virtue of her previous position as President and Chief Executive Officer of the Company.
Robert W. Eifler

Robert W. Eifler

Director since 2020
Mr. Eifler was named President and Chief Executive Officer of the Company in May 2020. Previously, Mr. Eifler served as Senior Vice President – Commercial of the Company from August 2019 until assuming his position as President and Chief Executive Officer. Mr. Eifler served as the Company’s Senior Vice President, Marketing and Contracts from February 2019 to August 2019 and as the Company’s Vice President and General Manager – Marketing and Contracts from July 2017 to August 2019. Prior to that time, Mr. Eifler led the Company’s marketing and contracts efforts for the Eastern Hemisphere while based in London. From November 2013 to March 2015, Mr. Eifler worked for Hercules Offshore, Inc., an offshore driller, as Director International Marketing. Mr. Eifler originally joined the Company in February 2005 as part of the management development program and held numerous operational and marketing roles with increasing responsibility around the world until joining Hercules in 2013. Mr. Eifler also serves on the board of directors for Oilfield Energy Center and the Offshore Technology Conference. Mr. Eifler brings to our Board extensive knowledge of the Company and the industry as the President and Chief Executive Officer of the Company.