Sir Julian Sorell Huxley FRS (22 June 1887 – 14 February 1975) was a British evolutionary biologist, eugenicist, and internationalist. He was a proponent of natural selection, and a leading figure in the mid-twentieth century modern evolutionary synthesis. He was secretary of the Zoological Society of London (1935–1942), the first Director of UNESCO, a founding member of the World Wildlife Fund and the first President of the British Humanist Association.