Before joining NASA at Johnson Space Center (JSC) in 1977, Dittemore worked as a turboprop/turbofan engine development engineer in Arizona. While at JSC, Dittemore held several positions, including flight director on 11 Space Shuttle missions,[2] deputy assistant director of the Space Station Program, and manager of Space Shuttle Program Integration. He assumed the position of manager of the Space Shuttle Program in 1999.[3]
Dittemore was the Shuttle Program Manager for NASA at the time of the disastrous loss of Space Shuttle Columbia in February 2003. On February 5, 2003, Dittemore incorrectly asserted that foam debris from the shuttle's external tank that struck the left wing during the launch could not have caused the reentry disintegration of the shuttle. Dittemore announced his resignation from NASA in April 2003.[4][5]