 AAON, Inc. NASDAQ-AAON announced today that Norman H. Asbjornson, Chief Executive Officer and Founder of AAON, Inc. the Company, will transition to the role of Executive Chairman, effective May 12, 2020. The Company also announced today that Gary D. Fields, President, will assume the role of Chief Executive Officer in addition to his current position of President, also to be effective May 12, 2020. 