Presently, Gary D. Fields holds the position of President, Chief Executive Officer & Director at AAON, Inc., Chief Executive Officer at AAON Coil Products, Inc. (a subsidiary of AAON, Inc.) and President & Owner at GKR Partners Ltd.

In his past career he occupied the position of Sales Representative at Texas Airsystems LLC and President for American Society of Heating Refrigerating & Air-Conditioning.