Mr. Atanasov has served as Executive Vice President and Chief Financial Officer since September 2022. Prior to joining HF Sinclair, Mr. Atanasov served as Chief Financial Officer of Lummus Technology LLC, a global chemical technologies company for the petrochemical and energy industries, from April 2022 to September 2022, as the Executive Vice President, Chief Financial Officer and Treasurer of Kraton Corporation, a NYSE listed specialty chemical company, from May 2019 until its merger with DL Holdings in March 2022 and as the Chief Financial Officer of Empire Petroleum Partners, LLC, a wholesale distributor of motor fuels, from February 2016 to May 2019. Prior to then, Mr. Atanasov served as Executive Vice President, Chief Financial Officer and Treasurer of NGL Energy Partners LP, a NYSE listed MLP, from May 2013 to February 2016, as Senior Vice President, Finance and Treasurer from September 2012 to May 2013 and as Vice President and Treasurer from November 2011 to September 2012. Prior to joining NGL, he held various finance roles of increasing responsibility with GE Capital from January 2003 to November 2011. He is a registered Certified Public Accountant.

Vaishali S. Bhatia has served as Executive Vice President since March 2023, as General Counsel since November 2019 and as Secretary since August 2019. Prior to then, she served as Senior Vice President from November 2019 to March 2023, Chief Compliance Officer from August 2019 to January 2020, Acting General Counsel from August 2019 to November 2019, Assistant General Counsel from May 2017 to August 2019, Assistant Secretary from May 2012 to August 2019 and Counsel from October 2011 to May 2017. Ms. Bhatia has also served as Executive Vice President of Holly Logistic Services, L.L.C. (“HLS”), the general partner of the general partner of Holly Energy Partners, L.P., since April 2023, General Counsel of HLS since November 2019 and Secretary of HLS since August 2019. She served as Senior Vice President of HLS from November 2019 to April 2023, Chief Compliance Officer of HLS from August 2019 to January 2020, Acting General Counsel of HLS from August 2019 to November 2019, Assistant General Counsel of HLS from May 2017 to August 2019, Assistant Secretary of HLS from January 2013 to August 2019 and Counsel of HLS from October 2011 to May 2017.Prior to joining the Company, Ms. Bhatia was an associate at Jones Day.

Steven C. Ledbetter has served as Executive Vice President, Commercial since March 2023. Prior to the joining the Company, Mr. Ledbetter served as Director, President and Chief Executive Officer of Shell Midstream Partners GP LLC, the general partner of Shell Midstream Partners, L.P., from March 2021 to March 2023, where he was responsible for the vision, strategy and execution of the Shell Midstream business. Prior to then, he served as Vice President, Commercial of Shell Midstream from April 2018 to March 2021, where he was responsible for business development, joint ventures, oil movements and portfolio activity. Mr. Ledbetter also served as the President and Chief Executive Officer of Jiffy Lube International from October 2013 to February 2018, a wholly owned subsidiary of Shell, where he was responsible for the vision, strategy, growth and profitability of the Jiffy Lube brand and network. He first joined Shell in 1999 and held various roles of increasing responsibility in the areas of finance, commercial deal structuring, operations management, strategy and business transformation during his 24 years at Shell.

Mr. Kunneman has served as Senior Vice President and Chief Human Resources Officer of the Company and Holly Logistic Services, L.L.C., the general partner of the general partner of Holly Energy Partners, L.P., since November 2021. He previously served as Vice President and Chief Human Resources Officer from April 2018 until November 2021. Prior to joining the Company, he was Executive Vice President of HR and Chief People & Culture Officer at Accudyne Industries. He also served in executive leadership roles in HR at Baker Hughes.

Director Since:

2017

Business Experience:

Ms. Ainsworth served as President and Chief Executive Officer of the general partner of Oiltanking Partners, L.P. and of Oiltanking Holding Americas, Inc., companies engaged in the terminaling, storage and transportation by pipeline of crude oil, refined petroleum products and liquefied petroleum gas, from 2012 until her retirement in 2014, Senior Vice President, Manufacturing of Sunoco Inc. from 2009 to 2012, and General Manager of the Motiva Enterprises, LLC Norco, Louisiana Refinery from 2006 to 2009. Prior to joining Motiva, Ms. Ainsworth served in various capacities at Royal Dutch Shell. Ms. Ainsworth is a graduate of the Institute of Corporate Directors Education Program (Rotman School of Management, University of Toronto and Haskayne School of Business, University of Calgary) and holds the ICD.D designation.

Additional Directorships:

Ms. Ainsworth has served on the boards of directors of Pembina Pipeline Corporation since 2014, Archrock, Inc. since 2015 and Kirby Corporation since 2015. She served on the board of directors of Seventy Seven Energy Inc. until 2015.

Director Since:

2009

Business Experience:

Mr. Echols served as Executive Vice President and Chief Financial Officer of Centex Corporation from 2000 until 2006. Before joining Centex, Mr. Echols held various positions, including managing partner, at Arthur Andersen LLP from 1978 until 2000.

Additional Directorships:

Mr. Echols is currently a member of the boards of directors of Trinity Industries, Inc. and EnLink Midstream Manager, LLC, the managing member of EnLink Midstream, LLC. Prior to the closing of the business combination among Devon Energy Corporation, Crosstex Energy, Inc. and Crosstex Energy, L.P. in 2014, Mr. Echols served on the board of directors of Crosstex Energy, L.P. and Crosstex Energy, Inc. Prior to the closing of the January 2019 simplification transaction between EnLink Midstream Partners, LP (formerly known as Crosstex Energy, L.P.), Mr. Echols served on the board of EnLink Midstream GP, LLC, the general partner of EnLink Midstream Partners, LP.

Director Since: 2023

Business Experience:

Timothy Go has served as Chief Executive Officer since May 2023 and as President since November 2021. He previously served as Chief Operating Officer from June 2020 to May 2023 and as Executive Vice President from June 2020 to November 2021. Prior to joining the Company, he served as Chief Executive 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 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 through September 20I5. Mr. Go served as Managing Director, Operations Excellence from August 2008 to June 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.

Director Since:

2019

Business Experience:

Mr. Knocke is a co-founder and a Director of Turtle Creek Trust Company, a private trust and investment management firm, since 2009. He currently serves as the Chief Investment Officer and has served as a Portfolio Manager at Turtle Creek Management, LLC, a registered investment advisory firm based in Dallas, Texas, since 2007. Since 2009, Mr. Knocke has served as a Principal and a non-controlling manager and member of TCTC Holdings, LLC (“TCTC”), a bank holding company that is a banking, securities, and investment management firm. He previously held positions as a Vice President and Portfolio Manager at Brown Brothers Harriman & Co., as well as positions at Salomon Brothers and Texas Instruments.

Director Since:

2011

Business Experience:

Mr. Lee has served as the Managing General Partner of Lee, Hite & Wisda Ltd., a private company with investments in oil and gas working, royalty and mineral interests, since founding the firm in 1984.

Additional Directorships:

Mr. Lee serves as a member of the Board of Directors of Holly Logistic Services, L.L.C., the general partner of the general partner of Holly Energy Partners, L.P. He previously served as a director of Frontier from 2000 until the merger in July 2011.

Director Since: 2022

Business Experience:

Mr. Szydlowski served as President and Chief Executive Officer and Director of SemGroup Corporation from November 2009 until his retirement in June 2014. He also previously served as Chief Executive Officer for Rose Rock Midstream and Colonial Pipeline Company. From 2004 to 2005, Mr. Szydlowski served as the Senior Consultant to the Iraqi Ministry of Oil in Baghdad on behalf of the U.S. Department of Defense (OSD, CPA) and Department of State (Embassy Baghdad). He was a Commissioner on the National Commission on Energy Policy and chaired the Task Force on Biofuels Infrastructure. Mr. Szydlowski co-chaired the Task Force on Ensuring Stable Natural Gas Prices for the Bipartisan Policy Center and was a member of the Working Group, Bipartisan Policy Center Response to The National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling Request. From 2002 until 2004, he was Vice President of Refining for Chevron Corporation and he first joined Chevron in 1981.

Additional Directorships:

Mr. Szydlowski currently serves as a director of Equitrans Midstream Corporation (“Equitrans”) and he served as a director of Sinclair Oil, which was comprised of the refining, marketing and renewables business HF Sinclair acquired from REH Company, from April 2017 until March 2022. Mr. Szydlowski served as a director of EQT Corporation (“EQT”) from November 2017 until the separation of EQT and Equitrans in November 2018. He served as a director of the general partner of 8point3 Energy Partners, LP from June 2015 until its acquisition by Capital Dynamics, Inc. in June 2018. Mr. Szydlowski also served as a director of the general partner of JP Energy Partners LP from July 2014 through March 2017.