Jason Gage has been the City of Brentwood's City Manager since April of 2025. He oversees the day-to-day operations of the city and ensures that the policies and programs approved  by the Board of Commissioners are implemented in an effective  and efficient manner. 

 A southwest Missouri native, Gage earned a Bachelor of Arts degree in political science from Missouri Southern State University and a Master of Public Administration degree from the University of Missouri. He is a credentialed member of the International City Manager's Association, and he previously served as the city manager for Salina, Kansas; Stillwater, Oklahoma; and De Soto, Missouri. Prior to coming to Brentwood, Jason spent more than six years as city manager of Springfield, Missouri.