British mathematician and philosopher Bertrand Russell died #OTD in 1970. He was one of the early 20th century's most prominent logicians and a founder of analytic philosophy, along with his predecessor Gottlob Frege, his friend and colleague G. E. Moore, and his student and protégé Ludwig Wittgenstein. Together with his former teacher A. N. Whitehead, Russell wrote Principia Mathematica. via @wikipedia
