Keith O. Rattie, 65, was chief executive officer of Questar Corp. from 2002 to 2010 and president from 2001 to 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. Rattie sits on the boards of Ensco PLC and Select Energy Services, Inc. Previously, he served as a director of Rockwater Energy Solutions, QEP Resources, EP Energy Corp. and Zions First National Bank.