Age 69 Independent Director since April 2015 Chair, Governance and Sustainability Committee Member, Audit Committee Qualifications Extensive leadership experience in the oil and gas industry Familiarity with governance issues, having served as chief executive officer of both public and private energy companies Experience operating a portfolio of energy assets including direct responsibility for safety Career Highlights President, Chief Executive Officer and director of the general partner of Oiltanking Partners, L.P. (a provider of terminal, storage and transportation services to the crude oil, refined petroleum and liquefied petroleum gas industries) and President and Chief Executive Officer of Oiltanking Holding Americas, Inc. from 2012 to 2014 Senior Vice President, Refining of Sunoco, Inc. (a petroleum and petrochemical manufacturer) from 2009 to 2012 General Manager of the Motiva Enterprises, LLC, refinery in Norco, Louisiana from 2006 to 2009 Director, Management Systems and Process Safety at Shell Oil Products U.S. from 2003 to 2006, and Vice President of Technical Assurance at Shell Deer Park Refining Company from 2000 to 2003 Board Service Director, member of the governance, nominating and corporate social responsibility committee as well as the safety, environment and operational excellence committee of Pembina Pipeline Corporation (a Canadian oil and gas pipeline company) Director and member of the audit committee and Chair of the ESG and nominating committee of Kirby Corporation (an operator of inland and offshore tank barge fleets in the U.S. and provider of diesel engine services) Director, chair of the environmental, health, safety and public policy committee and member of the finance committee of HF Sinclair Corp. (an independent petroleum refiner in the U.S.) Former director of Seventy Seven Energy Inc. from 2014 to 2015 Education BS, Chemical Engineering, cum laude, University of Toledo MBA, Rice University, where she also served as an Adjunct Professor from 2000 to 2009 Graduate, Institute of Corporate Directors Education Program, Rotman School of Management, University of Calgary, with ICD.D designation