Kathleen Kenyon was a young photographer then with a natural talent for archaeology. Solving a number of dating problems she soon advanced to the forefront of British archaeology through skill and judgement. In World War II she served as a commander in the Red Cross. In 1952–58 she took over operations at Jericho as the Director of the British School, verifying and expanding Garstang's work and conclusions. There were two Pre-pottery Neolithic periods, she concluded, A and B. Moreover, the PPN had been discovered at most of the major Neolithic sites in the near East and Greece. By this time her personal stature in archaeology was at least equal to that of V. Gordon Childe. While the three-age system was being attributed to Childe in popular fame, Kenyon became gratuitously the discoverer of the PPN. More significantly the question of revolution or evolution of the Neolithic was increasingly being brought before the professional archaeologists.