Who is Bertrand Russell from The Story of Philosophy and what is their importance?

Bertrand Russell is born in 1872 and lives until 1970. Bertrand Russell is born into one of the oldest and most famous English families. He is described as the youngest and most virile European thinker. There are two distinct periods in his life. The first Russell dies during the war and the second, mystic communist Russell arises after the war. In 1914 he is a cold-blooded theorist speaking at Columbia on epistemology. Russell's characteristic work, Mysticism and Logic, attacks the illogic of mysticism. He appears after the war as a man of infinite courage and passionate lover of humanity.