Dr. Jones made huge contributions to ECM
Churchill himself credited Jones with winning the "Battle of the Beams". Unlike the British and Americans, the Germans had employed a very capable radio navigation system that allowed their crews to hit targets even at night or in marginal weather. Jones discovered this capability and worked to develop the first countermeasures. Jones was all of 28 at the time.
I have another of his books that makes for fascinating reading. I bought it in London back in 1980. The British title was "The Wizard War" but I understand it was published under a different title in the US. The last I heard, Dr. Jones is still alive. I'd love to meet him. From his books and what others have written about him, he sounds like a fascinating man.