areppim: information, pure and simple
Turing award is generally considered to be the Nobel prize for computer science and has been granted to nationals from the big players in the IT (information technology) revolution. USA nationals have won 45, or 65% of all awards. The other big winners have been nationals from the United Kingdom with 7 wins (10%), Israel with 5 wins (7%), Canada, France and Norway with 2 wins each (Double nationals are accounted for twice in the chart.)
Formal recognition of women's contributions to the advancement of the field emerged only recently, although they played a pivotal role in many R&D teams. The women's quotum was often kept under a lid, and the success of the team's effort customarily credited fully and solely to the leading male scientists. Some of the recent female prizes have been awarded to try and correct that historical bias.
Source: ACM Awards: A. M. Turing Award.