Director Since July 2021 Age: 54 Key Skills and Attributes Industry Experience Risk Oversight and Management Operations / Strategic Planning Senior Leadership Finance / Accounting / Capital Allocation Human Capital Management / Safety Leadership Corporate Governance, Responsibility and Sustainability Committee Memberships Audit Investment Business Experience Select Energy Services, Inc. , a publicly traded provider of water management and chemical solutions to the energy industry President, Chief Executive Officer and director from November 2017 until January 2021 Rockwater Energy Solutions, Inc. , a provider of water management and chemical solutions to the energy industry Chairman, President and Chief Executive Officer from 2015 until November 2017 Various other positions from 2011 until 2015, including Executive Vice President Chemical Technologies and Chief Financial Officer Dynegy Inc. , then a publicly traded independent power producer Executive Vice President and Chief Financial Officer from 2005 until 2011 Various other positions from 2000 to 2005, including Chief Accounting Officer and Treasurer PricewaterhouseCoopers LLP Various positions from 1992 to 2000, including Senior Manager Other Board Experience Director of Marathon Oil Corporation, then a publicly traded independent exploration and production company, from March 2021 to November 2024 Director of Noble Energy, Inc., a publicly traded independent exploration and production company, from 2017 to October 2020 Director of Atlantic Power Corporation, a publicly traded independent power producer, from 2010 until 2018 Director of Rosetta Resources Inc., a publicly traded independent exploration and production company, from 2013 to 2015