Select Energy Services, Inc. announced the appointment of Nicholas L. Swyka as senior vice president and chief financial officer, succeeding Gary Gillette, who has been named senior vice president and chief administrative officer, effective May 15, 2018. The company also announced the promotion of Chris George to vice president, investor relations and treasurer. Since 2015, he has served as director of investor relations and corporate development at Nabors Industries.

Prior to Nabors, he served as director of corporate planning at Pacific Drilling from 2011 until 2015. Prior to that, he worked as a consultant with McKinsey & Company from 2008 to 2011, specializing in high-level strategic and operational challenges and opportunities in the energy industry.