English author, screenwriter, and essayist, Douglas Adams, is most remembered for his comedy science fiction series The Hitchhiker's Guide to the Galaxy. As a screenwriter, he wrote two stories for the TV series Doctor Who. He advocated for environmentalism and spoke about environmental issues in his non-fiction radio series Last Chance to See.
Stephen Hawking was an English theoretical physicist and cosmologist, who despite being afflicted motor neurone disease that severely limited his physical abilities, was able to build a phenomenally successful career. He was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics. Hawking was ranked 25 in the BBC's poll of the 100 Greatest Britons, in 2002.