Gary D. Fields served as Chief Executive Officer of AAON from May 2020 until May 2025 and as President from November 2016 until January 2024; effective May 13, 2025 he transitioned to Special Advisor to the Board. He was elected a director of AAON in 2015 and has been involved in the HVAC industry for more than 35 years. From 1983 to 2012 he was an HVAC equipment sales representative at Texas AirSystems, the largest independent HVAC equipment and solutions provider in Texas, and from 2002 to 2012 was a member of its ownership group.