On February 2, 1970, Bertrand Russell, a seminal philosopher, mathematician, and Nobel laureate, passed away at the age of 97. A British philosopher and mathematician, Russell's body of work revolutionized 20th century philosophy and mathematics, often viewed as the center of analytic philosophy. He wrote prolifically throughout his lifetime, and is credited with popularizing the scientific and philosophical theories of Albert Einstein, L. E. J. Brouwer, and David Hilbert. In 1950, Russell was awarded the Nobel Prize in Literature for his contributions to social, moral, and political philosophy, primarily as a statement of protest against nuclear weapons development. He became a vocal advocate of civil liberties and pacifism, becoming a central figure in the peace movement in the United Kingdom and beyond. His works include popular books such as The Problems of Philosophy, Principia Mathematica, and A History of Western Philosophy; various articles, columns, and pamphlets; and numerous influential essays such as "On Denoting." Russell leaves behind an enduring legacy as one of the most important philosophers, mathematicians, and social activists of the 20th century.