Thomas Henry Huxley (1825–1895) was an English biologist. Known as "Darwin's Bulldog" for his defence of Charles Darwin's theory of evolution. Mostly a self-educated man, he had an extraordinary influence on the British educated public. He was instrumental in developing scientific education in Britain, and opposed those Christian leaders who tried to stifle scientific debate. He was a member of eight Royal Commissions and two other commissions. A noted unbeliever, he used the term "agnostic" to describe his attitude to theism.