This British Philosopher and Mathematician was jailed for six months in London during the World War I, for his Pacifist writings.

During his confinement he wrote An Introduction To Mathematical Philosophy-which included a simpler account of his classic work Principia Mathematica (which had been written by him along with the British Mathematician A.E. Whitehead).

Although elected in 1908 to the Royal Society, Russell was convicted and fined for anti-war activities. He was dismissed from the Trinity College as a result of the conviction.

Two years later Russell was convicted a second time. This time he spent six months in prison. It was while in prison that he wrote his well-received Introduction to Mathematical Philosophy (1919).