Directors

Norman H. Asbjornson

Director

Gary D. Fields

CEO

Angela E. Kouplen

Independent Director

Caron A. Lawhorn

Independent Vice Chair

Stephen O. LeClair

Independent Director

A.H. McElroy II

Independent Chair

David R. Stewart

Independent Director

Bruce Ware

Independent Director

Norman H. Asbjornson

Director

Norman H. Asbjornson has served as a director of AAON, Inc., a Nevada corporation (“AAON” or “the Company”), since 1989, and currently serves in the class of directors whose terms will expire at the 2024 Annual Meeting of stockholders. Mr. Asbjornson also served as President of AAON from its inception until November 2016, Chief Executive Officer of AAON from its inception until May 2020, and Executive Chairman of AAON from May 2020 until May 2022. Mr. Asbjornson is one of the founders of the Company, and his intimate knowledge of the HVAC industry, both from a technical and a business perspective, brings to the Board a unique insight into the Company’s operations in particular, as well as the environment in which the Company operates. Since his retirement as Executive Chairman in May 2022, Mr. Asbjornson has served the Company in a consulting and advisory role, effective until May 2024.

Gary D. Fields

CEO

Gary D. Fields has served as Chief Executive Officer since May 2020.  Prior to that he served as President of AAON since November 2016. He was elected as a director of AAON in 2015, and currently serves in the class of directors whose terms will expire at the 2024 Annual Meeting. Mr. Fields has been involved in the HVAC industry for more than 35 years. From 1983 to 2012, Mr. Fields was an HVAC equipment sales representative at (and, from 2002 to 2012, a member of the ownership group of) Texas AirSystems, the largest independent HVAC equipment and solutions provider in the state of Texas, with locations in Dallas, Fort Worth, Houston, Austin and San Antonio. Mr. Fields has been significantly involved with the Fort Worth, Texas Chapter of ASHRAE (the American Society of Heating, Refrigerating and Air-Conditioning Engineers), having served as Chairman of various ASHRAE committees and ultimately serving as President of the Society.

Mr. Fields is currently an owner and President of GKR Partners LTD, an HVAC business development consulting firm, which provided business development advice and consultation to the Company and its sales representatives from 2013 to 2016. Mr. Fields also serves as the President and Chief Executive Officer of AAON-Oklahoma, Chief Executive Officer of AAON Coil Products, and Chief Executive Officer of BasX, Inc.

Mr. Fields' extensive experience in the HVAC industry provides the Board with valuable insight and knowledge on HVAC markets, including market trends. Mr. Fields' lengthy experience at a large independent HVAC equipment provider also allows him to provide the Board guidance on the Company's sales and marketing activities. In addition, Mr. Fields' detailed knowledge of the Company's product lines (as well as the product lines of the Company's competitors) enables him to provide the Board with unique insight into the Company's strengths and strategic opportunities to improve its position in the marketplace.

Angela E. Kouplen

Independent Director

Angela E. Kouplen was elected for an initial two-year term as a director of AAON in 2016, and currently serves in the class of directors whose terms will expire at the 2024 Annual Meeting of stockholders. She serves as Chair of our Compensation Committee and as a member of our Audit Committee. Ms. Kouplen has over 20 years of experience at multiple energy companies, with an emphasis on information technology (“IT”), contract management, sourcing/vendor relations, human resource management, strategy and governance. From 1997 through 2007, Ms. Kouplen worked at CITGO Petroleum, a petroleum refining, marketing and transportation company, in various IT related positions, including Manager - E-Business Strategy and Alliance, as well as Manager - Third Party Applications and Applications Development. From 2007 through 2010, Ms. Kouplen served Williams Companies, a Tulsa based publicly traded energy company, in the position of Manager - Sourcing Management Office. From 2010 through 2011, Ms. Kouplen served Williams Companies as Manager - IT Strategy and Governance. In 2012, Ms. Kouplen transitioned from Williams Companies to WPX Energy, a Tulsa based stand-alone publicly traded energy company previously part of the Williams Companies. Following the move to WPX Energy, from 2012 through 2014, Ms. Kouplen served as Director - Talent Acquisition and Leadership, from 2015 to 2016 she served as Vice President - Information Technology, from 2016 to November 2018, she served as Vice President of Administration and Chief Information Officer and from November 2018 to March 2021 served as Senior Vice President of Administration and Chief Information Officer.

Since August 2021, Ms. Kouplen has served as the Interim Chief Information Officer at the University of Tulsa. Ms. Kouplen holds a bachelor’s degree in Management from Oklahoma State University and an M.B.A from the University of Tulsa. Ms. Kouplen’s extensive experience in IT related positions provides the Board with valuable insight and enhanced knowledge on IT matters, which are increasingly vital to the Company’s operations and success. Additionally, Ms. Kouplen brings to the board experience in sourcing/vendor relations and human resources; two areas which the Board views as vital to the future growth and profitability of the Company.

Ms. Kouplen's diverse and lengthy experience in senior management and executive level positions at large publicly traded companies allows her to provide the Board guidance on the Company’s IT practices, human resources programs and sourcing/vendor relations activities, while also giving her the ability to compare such practices against those of other publicly traded companies, all of which strengthen the effectiveness and broaden the skill set of our Board.

Caron A. Lawhorn

Independent Vice Chair

Caron A. Lawhorn was elected as a director of AAON in January 2019, appointed as Vice Chair of the Board in May 2022, and currently serves in the class of directors whose terms will expire at the 2023 Annual Meeting. She is a certified public accountant and serves as Chair of our Audit Committee and a member of our Governance Committee. Ms. Lawhorn has over 35 years of experience in various accounting, finance, operational and executive positions. Ms. Lawhorn currently serves as Senior Vice President and Chief Financial Officer of ONE Gas, Inc. (a position she has held since March 1, 2019), and in such role is responsible for finance, accounting, treasury functions, investor relations, and environmental, social, and governance ("ESG") reporting. Prior to 3 of 5 her current role, she served as Senior Vice President, Commercial, a position she held from ONE Gas’s separation from ONEOK, Inc. in January, 2014. Prior to ONE Gas’s separation from ONEOK, Ms. Lawhorn served in the same role at ONEOK. Prior to assuming the role of Senior Vice President, Commercial for ONEOK, Ms. Lawhorn was the President of ONEOK’s natural gas distribution segment. From July 2009 to March 2011, she served as Senior Vice President, Corporate Planning and Development of ONEOK and ONEOK Partners, responsible for business development, strategic and longrange planning and capital investment. Ms. Lawhorn became Senior Vice President and Chief Accounting Officer of ONEOK in 2007, adding responsibility for ONEOK Partners in 2008.

Prior to that, she was Senior Vice President of Financial Services and Treasurer of ONEOK. Ms. Lawhorn joined ONEOK in 1998, after serving as a Senior Manager at KPMG and Chief Financial Officer of Emergency Medical Services Authority in Tulsa.

Ms. Lawhorn’s extensive background in various accounting, finance, operational and executive positions provides the Board with significant accounting and financial expertise and assists the Board’s ongoing efforts to advance the Company’s accounting and corporate governance practices. Ms. Lawhorn’s public company experience also allows her to compare our practices against those of other public companies and provide input and guidance on strengthening our practices and procedures.

Stephen O. LeClair

Independent Director

Stephen O. (“Steve”) LeClair was elected as a director of AAON in 2017 and currently serves in the class of directors whose terms will expire at the 2023 AnnualMeeting. He is a member of our Audit Committee and Governance Committee. Mr.LeClair has over 25 years of experience in various executive, manufacturing, finance, sales and operational positions. Mr. LeClair currently serves as Chief Executive Officer of Core & Main, Inc. (NYSE: CNM) (a position he has held since August 2017), and in such role is responsible for leading the nation’s largest distributor of water, sewer, storm and fire protection products.

Prior to his current role, he served as President of HD SupplyWaterworks from December 2011 to August 2017, Chief Operating Officer from 2008 to2011, and President of Lumber and Building Materials from April 2007 until its divestiture to ProBuild Holdings in 2008. Mr. LeClair joined Core & Main in 2006 as Senior Director of Operations. Prior to joining Core & Main, Mr. LeClair was a Senior Vice President atGeneral Electric (GE) Capital Equipment Services from 2002 to 2005, and from 1992 to2002 held various roles at GE Appliances and Power Generation in distribution, manufacturing and sales. Mr. LeClair is a graduate of GE Power Generation’sManufacturing Management Program. He was previously a member of the Saint LouisUniversity’s International Business School Advisory Board. Mr. LeClair holds a bachelor’s degree in Mechanical Engineering from Union College and an M.B.A. degree from theUniversity of Louisville.

Mr. LeClair’s extensive experience in operations, distribution, manufacturing and sales at two large public companies brings to the Board strategic and operational expertise that provides valuable insight to the Board across several phases of AAON’s business. Mr. LeClair’s public company experience also allows him to compare and assess the differences in our operations and functions against other publicly traded 4 of 5companies, which enables him to provide input and guidance on strengthening the practices of AAON.

A.H. McElroy II

Independent Chair

A.H. (“Chip”) McElroy II was elected as a director of AAON in 2007, appointed as Independent Director of the Board in May 2022, and currently serves in the class of directors whose terms will expire at the 2025 annual meeting of stockholders. He is Chair of our Governance Committee and serves as a member of our Compensation Committee. Since 1997 Mr. McElroy has served as President, CEO and Chairman of McElroy Manufacturing, Inc., a privately held manufacturing company based in Tulsa, Oklahoma. Since 2002, Mr. McElroy has also served as Chairman of Southern Specialties Co., a privately held specialty sheet metal manufacturer. Since 2016, Mr. McElroy has served on the board of directors of Pryer Aerospace, a privately held Tulsa, Oklahoma based aerospace structural component and sheet metal manufacturer, and from 2016 to June 2019, served on the Advisory Board of HydroHoist Marine Group, a privately held Claremore, Oklahoma based boat lift manufacturer.

Since 2017, Mr. McElroy has served as a member on the local advisory board of directors of Ascension St. John Health System, a healthcare system in northeastern Oklahoma and Southern Kansas. Mr. McElroy’s extensive experience in managing a privately held manufacturing company brings to the Board substantial knowledge of operational and budgetary efficiencies, as well as technology-related applications which benefit the Company's general manufacturing processes.

David R. Stewart

Independent Director

David R. Stewart was elected as a director of AAON in October 2021, and currently serves in the class of directors whose terms will expire at the 2023 Annual Meeting. Mr. Stewart serves as a member of our Audit Committee and Governance Committee. Mr. Stewart brings over 40 years of professional experience to the Board. Mr. Stewart currently serves as Chief Administrative Officer and Trustee of the Oklahoma Ordnance Works Authority located in Pryor, Oklahoma, an industrial public trust that owns and operates MidAmerica Industrial Park.

Mr. Stewart was appointed to his current position in December 2012 by the former Governor of Oklahoma, Mary Fallin. MidAmerica Industrial Park consists of 9,000 acres and is home to over 80 companies in diverse industries (including Google, DuPont and Chevron Phillips), employing approximately 4,500 people. MidAmerica Industrial Park is one of the largest industrial parks in the U.S. and top ten in the world with on-site rail, water and electric power. Prior to his current position, Mr. Stewart served as Chief Executive Officer of Cherokee Nation Businesses, LLC. During his tenure as CEO of Cherokee Nation Businesses, LLC, Mr. Stewart, also a member of the Cherokee Nation, helped negotiate the State-Tribal Gaming Compact in 2004, and also led the Cherokee Nation’s efforts to successfully diversify its business portfolio to include a wide range of non-gaming enterprises employing over 3,500 people. Mr. Stewart earned his Master of Science and Bachelor of Science degrees from Oklahoma State University and is a certified public accountant. Mr. Stewart was appointed by Governor Kevin Stitt to (and currently serves on) the Oklahoma State Board of Career and Technology Education, which provides oversight of the career technical training system in the state of Oklahoma. He also serves on the Board of Directors of the 5 of 5 State Chamber of Oklahoma and the Tulsa Regional Chamber, where he also serves on the Executive Committee as Vice-Chair for Government Affairs. Additionally, Mr. Stewart serves on the Advisory Board of Equity Bank, a wholly-owned subsidiary of Equity Bancshares, Inc., a publicly traded bank holding company headquartered in Wichita, Kansas operating more than 50 full-service branches in Arkansas, Kansas, Missouri and Oklahoma, and recently served on the Advisory Council to the Oklahoma Department of Commerce concerning economic development and workforce related matters.

Mr. Stewart's extensive executive leadership and operations experience brings the Company valuable skills and insight to the Board in several strategic areas. His experience previously serving as the CEO of the Cherokee Nations Businesses, LLC and current role as Chief Administrative Officer of MidAmerica Industrial Park, benefit the Company's executive leadership practices.

Bruce Ware

Independent Director

Bruce Ware was elected as a director of AAON in October 2021, and currently serves in the class of directors whose terms will expire at the 2025 Annual Meeting. Mr. Ware serves as a member of our Audit Committee and Compensation Committee. Mr. Ware brings significant experience serving in multiple executive and leadership roles at publicly traded companies. Presently, he serves as a Corporate Vice President and Group Head of Joint Venture Capital Raising for DaVita Inc. DaVita is a Fortune 500 NYSE publicly traded health care services company and one of the largest providers of kidney care services in the U.S., with over 2,800 outpatient dialysis centers in the U.S. and over 330 outpatient dialysis centers in ten other countries. Mr. Ware earned a Master of Business Administration from Harvard Business School, a Master in Public Affairs from The University of Texas at Austin and a Bachelor degree in Business Administration in Banking and Finance from The University of Mississippi at Oxford. He also serves on the Board of Directors of Blackhawk Bancorp, Inc., the parent company of Blackhawk Bank, a Beloit, Wisconsin headquartered financial institution operating eleven full-service banking centers in Wisconsin and Illinois, as well as the University of Mississippi National Alumni Board. Additionally, Mr. Ware served as a Trustee of Uplift Charter Schools, a high-performing, multi-site K-12 public charter school system in Dallas, Texas, which serves over 17,000 students.

Mr. Ware's executive roles at multiple publicly traded companies brings experience and skills to help the Company strengthen our practices and policies. Additionally, his extensive experience working with large financial institutions provides AAON with a broader skill-set to further compliment the Board's capabilities and better serve the Company.