HF Sinclair Corporation announced the promotion of Tim Go to the position of Chief Executive Officer and President of HF Sinclair, effective May 9, 2023. Mr. Go has served as President and Chief Operating Officer of HF Sinclair since November 2021. He served as Executive Vice President and Chief Operating Officer of HF Sinclair from June 2020 to November 2021.

Prior to joining HF Sinclair, Mr. Go served as Chief Executive Officer of the general partner of Calumet Specialty Products Partners, L.P., an independent producer of specialty hydrocarbon products, from January 2016 to April 2020 and retired from Calumet in June 2020. Prior to joining Calumet, he served in various leadership roles at Koch Industries Inc. and Flint Hills Resources, LP, a wholly-owned subsidiary of Koch Industries Inc. from August 2008 to September 2015, having most recently served as Vice President, Operations of Flint Hills Resources, LP from July 2012 to September 2015. Prior to joining Koch Industries, he held various roles of increasing responsibility in downstream operations during his 18 years at ExxonMobil Corporation.

Mr. Go brings to the Board extensive industry experience and familiarity with the day-to-day operations of HF Sinclair. He provides a significant resource for the Board and facilitates communication between management and the Board. Mr. Go succeeds Michael C. Jennings, who currently serves as the Chief Executive Officer of HF Sinclair and will continue serving in that role through May 8, 2023.