HollyFrontier Corp., Dallas, has promoted Tim Go to president and chief operating officer, effective immediately.
Go’s responsibilities will include oversight of the company’s refining and lubricants and specialty products segments. Mike Jennings, who previously served as chief executive officer and president of HollyFrontier, will continue to serve as chief executive officer.
Go has served as executive vice-president and chief operating officer of HollyFrontier since June 2020. Prior to joining HollyFrontier, he served as chief executive officer of the general partner of Calumet Specialty Products Partners LP from January 2016 to April 2020 and retired from Calumet in June 2020. Prior to joining Calumet, Go worked in roles of increasing responsibility at Flint Hills Resources and in downstream operations at ExxonMobil.