Original: Bertrand Arthur William Russell , 3rd Earl Russell , OM , FRS ( 18 May 1872 -- 2 February 1970 ) , commonly known as simply Bertrand Russell , was a British philosopher , logician , mathematician , historian , religious skeptic , social reformer , socialist and pacifist .
Simplified: Bertrand Arthur William Russell , 3rd Earl Russell , ( 18 May 1872 -- 2 February 1970 ) , was one of the world 's best-known intellectuals .