HollyFrontier CEO and Leadership

Mr. Jennings has served as Chief Executive Officer and President of HollyFrontier since January 1, 2020. He served as Executive Vice President of HollyFrontier from November 2019 through December 2019, as Executive Chairman of HollyFrontier from January 2016 until January 2017 and as the Chief Executive Officer and President of HollyFrontier from the merger of Holly Corporation (“Holly”) and Frontier Oil Corporation (“Frontier”) in July 2011 until January 2016. He served as Chairman of the Board of HollyFrontier from January 2017 to February 2019 and January 2013 to January 2016. Mr. Jennings has served as Chief Executive Officer of Holly Logistic Services, L.L.C. (“HLS”) since January 2020. He previously served as Chief Executive Officer of HLS from January 2014 to November 2016 and as President of HLS from October 2015 to February 2016. Mr. Jennings previously served as President and Chief Executive Officer of Frontier from 2009 until the merger of Holly and Frontier in July 2011 and as the Executive Vice President and Chief Financial Officer of Frontier from 2005 until 2009.

Mr. Go has served as Executive Vice President of HollyFrontier since June 2020. Prior to that time, he served as Chief Operating Officer of the general partner of Calumet Specialty Products Partners, L.P. from January 2016 to April 2020 and retired from Calumet in June 2020. Prior to joining Calumet. Mr. Go served as Vice President, Operations of Flint Hills Resources, LP, a wholly-owned subsidiary of Koch Industries, Inc., from July 2012 through September 20I 5 and as Vice President, Operations Excellence of Flint Hills Resources, LP from June 2011 through July 2013. Mr. Go served as Managing Director, Operations Excellence from August 2008 through 2011 of Koch Industries, Inc. Prior to joining Koch Industries, Mr. Go held various roles of increasing responsibility in downstream operations during his 18 years at ExxonMobil Corporation.

Senior HR leader with 20+ years of international HR and operational experience in the oil & gas and manufacturing industries. Demonstrable record of successfully/proactively leading change across geographic/cultural boundaries, driving organizational change/efficiency & integrating Human Capital with business strategy. Expertise in HR functional leadership; business integration; M&As and divestitures; talent mgt, shared services & executive comp informs all his work. Worked/lived in North and Latin America, Europe, Africa, China, India, Russia & the Middle East.

Mr. Jennings has served as Chief Executive Officer and President of HollyFrontier since January 1, 2020. He served as Executive Vice President of HollyFrontier from November 2019 through December 2019, as Executive Chairman of HollyFrontier from January 2016 until January 2017 and as the Chief Executive Officer and President of HollyFrontier from the merger of Holly Corporation (“Holly”) and Frontier Oil Corporation (“Frontier”) in July 2011 until January 2016. He served as Chairman of the Board of HollyFrontier from January 2017 to February 2019 and January 2013 to January 2016. Mr. Jennings has served as Chief Executive Officer of Holly Logistic Services, L.L.C. (“HLS”) since January 2020. He previously served as Chief Executive Officer of HLS from January 2014 to November 2016 and as President of HLS from October 2015 to February 2016. Mr. Jennings previously served as President and Chief Executive Officer of Frontier from 2009 until the merger of Holly and Frontier in July 2011 and as the Executive Vice President and Chief Financial Officer of Frontier from 2005 until 2009.