While at the South London Branch of the National Secular Society, philosopher Bertrand Russell delivers his now-famous address "Why I Am Not a Christian."
Russell was a British mathematician and philosopher who, along with A.N. Whitehead, wrote Principia Mathematica in 1903, an important landmark in the development of logic and the philosophy of mathematics.
Russell also became well known for his principled stand on pacifism and his pointed critiques of religion and dogmatic beliefs generally. He was imprisoned, fined, lost his teaching post at Cambridge when he condemned both sides during World War I. His critiques of religion and his advocacy of sexual freedom caused him to lose a teaching appointment to the City College of New York.