Elizabeth Annette Essex-Cohen (1940-2004)

Dr Elizabeth Annette Essex-Cohen]] (b. 21 April 1940 at Grafton, New South Wales, d. 21 March 2004), gained international recognition as an ionosphere physicist with her pioneering work on the Global Positioning System (GPS); a brass plaque was presented on her behalf at her former high school, Grafton High, the year after she died.