ExxonMobil Chairman and CEO Darren Woods (left) and Pioneer CEO Scott Sheffield [Photos: Business Wire]
Pioneer Natural Resources CEO Scott Sheffield, left, will retire at year end. COO Richard Dealey has been named as the shale oil producer's next chief executive officer. [photos: Pioneer Natural Resources]
Dallas-based independent energy company HF Sinclair Corp. has promoted Tim Go to chief executive officer and president and appointed him to its board of directors, effective May 9....