HollyFrontier Corporation announced the promotion of Tim Go to the position of President and Chief Operating Officer of HollyFrontier effective immediately. As President and Chief Operating Officer, Mr. Go?s responsibilities will include oversight over HollyFrontier?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 of HollyFrontier. Mr. 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, L.P. (Calumet) from January 2016 to April 2020 and retired from Calumet in June 2020.