[1] He was commissioned from RAF aircrew to the Technical Branch-Signals, where he developed radar and microwave systems using the magnetron.
This method was used for the first VLBI measurements, and a modified form of this approach ("Self-Calibration") is still used today at radio, optical and infrared wavelengths.
With the latter, Jennison reported his personal encounter with the phenomenon as an airline passenger during a flight in March 1963, when a glowing ball of light was created inside the aircraft following a lightning strike.
The building which he helped design to house the Electronics Laboratory, now the seat of the School of Engineering and Digital Arts, was named after him by the University of Kent in 2009.
Roger Clifton Jennison's interest in the arts may have been stimulated by his father, George Robert Jennison, who was a well-known portrait painter in his home town of Grimsby and whose work is still on display in Grimsby Town Hall.