Keith O. Rattie, 66, joined the board of directors in June 2019. He is currently a director of Select Energy Services, Inc. and serves on the audit committee and as chairman of the nominating and governance committee. He has more than 40 years of experience in the oil and gas industry, including as President of Questar Corp. from 2001 until 2010 and chief executive officer from 2002 until 2010. He also served on Questar’s board from 2001 until 2014, including as chairman from 2003 until 2010 and non-executive chairman from 2010 to 2012. Before joining Questar, Rattie was an executive with Coastal Corporation, a diversified energy company. He also spent 19 years with Chevron Corp. in various engineering and management positions, including as general manager of Chevron’s international gas unit. Rattie earned a bachelor’s degree in electrical engineering from the University of Washington and a master’s in business administration from St. Mary’s College.