Leadership Transition Announced as AAON Appoints Matt J. Tobolski as CEO AAON has revealed that Matt J. Tobolski, PhD, will assume the role of CEO effective May 13, 2025, succeeding Gary Fields. Tobolski, currently president and COO, brings extensive experience in data center cooling. Fields will remain on the board, supporting a smooth transition during a critical growth phase for the company.43