Lt Col Gardner attended Texas A&M University where he was a member of Squadron 2 and Parsons Mounted Cavalry. He graduated with a degree in Mechanized Agriculture and was commissioned a 2nd Lieutenant in the Air Force on 13 August 1982. Lt Col Gardner earned his Masters of Public Administration degree from Troy State University and is a graduate of Air Command and Staff College, Armed Forces Staff College and Air War College.
His many assignments include one Major Command Headquarters Tour and two Joint Level Headquarters Tours. Lt Col Gardner spent six years in the European Command and served twice as a training Squadron Commander. He culminated his 25 year career as the Professor of Aerospace Studies and Air Force ROTC instructor at AFROTC Detachment 805 at Texas A&M.