Len Cook, New Zealand-English mathematician and statistician
Leonard Warren Cook CBE (born 13 April 1949) is a professional statistician who was Government Statistician of New Zealand from 1992 to 2000, and National Statistician and Director of the United Kingdom Office for National Statistics, and Registrar General for England and Wales from 2000 to 2005. He served as Families Commissioner in New Zealand from 2015 to 2018.