Bertrand Arthur William Russell, 3rd Earl Russell, OM, FRS (18 May 1872 – 2 February 1970), was a British philosopher, logician, mathematician, historian, and social critic. At various points in his life he imagined himself a liberal, a socialist, and a pacifist, but he also admitted that he had never been any of these things, in any profound sense. He was born in Wales, into one of the most prominent aristocratic families in Britain.

Russell led the British "revolt against idealism" in the early 1900s. He is considered one of the founders of analytic philosophy along with his predecessor Gottlob Frege and his protégé Ludwig Wittgenstein, and is widely held to be one of the 20th century's premier logicians. He co-authored, with A.N. Whitehead, Principia Mathematica, an attempt to ground mathematics on logic. His philosophical essay "On Denoting" has been considered a "paradigm of philosophy." His work has had a considerable influence on logic, mathematics, set theory, linguistics, computer science (type theory and type system), and philosophy, especially philosophy of language, epistemology, and metaphysics.

Russell was a prominent anti - war activist; he championed free trade and anti - imperialism. Russell went to prison for his pacifism during World War I. Later, he campaigned against Adolf Hitler, then criticised Stalinist totalitarianism, attacked the United States of America's involvement in the Vietnam War, and was an outspoken proponent of nuclear disarmament. One of his last acts was to issue a statement which condemned Israeli aggression in the Middle East.

In 1950, Russell was awarded the Nobel Prize in Literature, "in recognition of his varied and significant writings in which he champions humanitarian ideals and freedom of thought."

Bertrand Russell was born on 18 May 1872 at Ravenscroft, Trellech, Monmouthshire, Wales, into an influential and liberal family of the British aristocracy. His paternal grandfather, John Russell, 1st Earl Russell, was the third son of John Russell, 6th Duke of Bedford, and had twice been asked by Queen Victoria to form a government, serving her as Prime Minister in the 1840s and 1860s. The Russells had been prominent in England for several centuries before this, coming to power and the peerage with the rise of the Tudor dynasty. They established themselves as one of Britain's leading Whig families, and participated in every great political event from the Dissolution of the Monasteries in 1536 – 40 to the Glorious Revolution in 1688 – 89 to the Great Reform Act in 1832. Russell's mother Katharine Louisa (1844 – 1874) was the daughter of Edward Stanley, 2nd Baron Stanley of Alderley, and was the sister of Rosalind Howard, Countess of Carlisle. Kate and Rosalind's mother was one of the founders of Girton College, Cambridge. Russell's parents were radical for their times. Russell's father, Viscount Amberley, was an atheist and consented to his wife's affair with their children's tutor, the biologist Douglas Spalding. Both were early advocates of birth control at a time when this was considered scandalous. John Russell's atheism was evident when he asked the philosopher John Stuart Mill to act as Russell's secular godfather. Mill died the year after Russell's birth, but his writings had a great effect on Russell's life.

Russell had two siblings: Frank (nearly seven years older than Bertrand), and Rachel (four years older). In June 1874 Russell's mother died of diphtheria, followed shortly by Rachel's death. In January 1876, his father also died of bronchitis following a long period of depression. Frank and Bertrand were placed in the care of their staunchly Victorian grandparents, who lived at Pembroke Lodge in Richmond Park. John Russell, 1st Earl Russell, his grandfather, who had been Prime Minister, died in 1878, and was remembered by Russell as a kindly old man in a wheelchair. As a result, his widow, the Countess Russell (née Lady Frances Elliot), was the dominant family figure for the rest of Russell's childhood and youth.

The countess was from a Scottish Presbyterian family, and successfully petitioned the Court of Chancery to set aside a provision in Amberley's will requiring the children to be raised as agnostics. Despite her religious conservatism, she held progressive views in other areas (accepting Darwinism and supporting Irish Home Rule), and her influence on Bertrand Russell's outlook on social justice and standing up for principle remained with him throughout his life — her favourite Bible verse, 'Thou shalt not follow a multitude to do evil' (Exodus 23:2), became his motto. The atmosphere at Pembroke Lodge was one of frequent prayer, emotional repression and formality; Frank reacted to this with open rebellion, but the young Bertrand learned to hide his feelings.

Russell's adolescence was very lonely, and he often contemplated suicide. He remarked in his autobiography that his keenest interests were in religion and mathematics, and that only the wish to know more mathematics kept him from suicide. He was educated at home by a series of tutors. His brother Frank introduced him to the work of Euclid, which transformed Russell's life.

Also, during these formative years, he discovered the works of Percy Bysshe Shelley. In his autobiography, he writes: "I spent all my spare time reading him, and learning him by heart, knowing no one to whom I could speak of what I thought or felt, I used to reflect how wonderful it would have been to know Shelley, and to wonder whether I should meet any live human being with whom I should feel so much sympathy." Russell claimed that beginning at age 15, he spent considerable time thinking about the validity of Christian religious dogma, and by 18 had decided to discard the last of it.

Russell won a scholarship to read for the Mathematical Tripos at Trinity College, Cambridge, and commenced his studies there in 1890. He became acquainted with the younger G.E. Moore and came under the influence of Alfred North Whitehead, who recommended him to the Cambridge Apostles. He quickly distinguished himself in mathematics and philosophy, graduating as a high Wrangler in 1893 and becoming a Fellow in the latter in 1895.

Russell first met the American Quaker Alys Pearsall Smith when he was 17 years old. He became a friend of the Pearsall Smith family — they knew him primarily as 'Lord John's grandson' and enjoyed showing him off — and travelled with them to the continent; it was in their company that Russell visited the Paris Exhibition of 1889 and was able to climb the Eiffel Tower soon after it was completed.

He soon fell in love with the puritanical, high - minded Alys, who was a graduate of Bryn Mawr College near Philadelphia, and, contrary to his grandmother's wishes, married her on 13 December 1894. Their marriage began to fall apart in 1901 when it occurred to Russell, while he was cycling, that he no longer loved her. She asked him if he loved her and he replied that he didn't. Russell also disliked Alys's mother, finding her controlling and cruel. It was to be a hollow shell of a marriage and they finally divorced in 1921, after a lengthy period of separation. During this period, Russell had passionate (and often simultaneous) affairs with a number of women, including Lady Ottoline Morrell and the actress Lady Constance Malleson.

Russell began his published work in 1896 with German Social Democracy, a study in politics that was an early indication of a lifelong interest in political and social theory. In 1896, he taught German social democracy at the London School of Economics, where he also lectured on the science of power in the autumn of 1937. He was also a member of the Coefficients dining club of social reformers set up in 1902 by the Fabian campaigners Sidney and Beatrice Webb.

He now started an intensive study of the foundations of mathematics at Trinity during which he discovered Russell's paradox which challenged the foundations of set theory. In 1903 he published his first important book on mathematical logic, The Principles of Mathematics showing that mathematics could be deduced from a very small number of principles, and contributing significantly to the cause of logicism.

In 1905 he wrote the essay "On Denoting", which was published in the philosophical journal Mind. Russell became a fellow of the Royal Society in 1908. The first of three volumes of Principia Mathematica, written with Whitehead, was published in 1910, which, along with the earlier The Principles of Mathematics, soon made Russell world famous in his field.

In 1910 he became a lecturer in the University of Cambridge where he soon received an approach from the Austrian engineering student Ludwig Wittgenstein, who became his PhD student and whom he viewed as a genius and a successor who would continue his work on logic. He spent hours dealing with Wittgenstein's various phobias and his frequent bouts of despair. This was often a drain on Russell's energy, but Russell continued to be fascinated by him and encouraged his academic development, including the publication of Wittgenstein's Tractatus Logico - Philosophicus in 1922. Russell delivered his lectures on Logical Atomism, his version of these ideas, in 1918 before the end of the First World War and whilst Wittgenstein was still a prisoner of war.

During the First World War, Russell was one of a very small number of intellectuals engaged in pacifist activities, and, in 1916, he was dismissed from Trinity College following his conviction under the Defence of the Realm Act. He was charged a fine of 100 Pounds Sterling which he refused to pay, hoping that he would be sent to prison, but they instead sold his books at auction to raise the money. The books were bought by friends and he later treasured his copy of the King James Bible that was stamped "Confiscated by Cambridge Police." He was reinstated 1919, resigned 1920, was Tarner Lecturer 1926, and became a Fellow again 1944 – 1949. A later conviction for publicly lecturing against inviting the US to enter the war on Britain's side, resulted in six months' imprisonment in Brixton prison. Russell was released from prison in September 1918.

In August 1920, Russell travelled to Russia as part of an official delegation sent by the British government to investigate the effects of the Russian Revolution. He met Vladimir Lenin and had an hour long conversation with him. In his autobiography, he mentions that he found Lenin rather disappointing, sensing an "impish cruelty" in him and comparing him to "an opinionated professor". He also cruised down the Volga on a steam ship. Russell's lover Dora Black also visited Russia independently at the same time — she was enthusiastic about the revolution, but Russell's experiences destroyed his previous tentative support for it. He wrote a book "The Practice and Theory of Bolshevism" about his experiences on this trip, which included 24 others from Britain, all of whom came home thinking well of the regime, despite Russell's attempts to change their mind. For example, he told them that he heard shots fired in the middle of the night and was sure these were clandestine executions, but the others maintained that it was only cars backfiring.

Russell subsequently lectured in Beijing on philosophy for one year, accompanied by Dora. He went there with optimism and hope, as China was then on a new path. Among other scholars there was Rabindranath Tagore, the Indian poet and also a Nobel Laureate. While in China, Russell became gravely ill with pneumonia, and incorrect reports of his death were published in the Japanese press. When the couple visited Japan on their return journey, Dora notified the world that "Mr. Bertrand Russell, having died according to the Japanese press, is unable to give interviews to Japanese journalists." The press were not amused and did not appreciate the sarcasm.

On the couple's return to England on 26 August 1921, Dora was six months pregnant, and Russell arranged a hasty divorce from Alys, marrying Dora six days after the divorce was finalised, on 27 September 1921. Their children were John Conrad Russell, 4th Earl Russell, born on 16 November 1921 and Katharine Jane Russell (now Lady Katharine Tait) born on 29 December 1923. Russell supported himself during this time by writing popular books explaining matters of physics, ethics, and education to the layman. Some have suggested that at this point he had an affair with Vivienne Haigh - Wood, first wife of T.S. Eliot.

Together with Dora, he also founded the experimental Beacon Hill School in 1927. The school was run from a succession of different locations, including its original premises at the Russells' residence, Telegraph House, near Harting, West Sussex. On 8 July 1930 Dora welcomed her third child, a daughter, Harriet Ruth. After he left the school in 1932, Dora continued it until 1943.

Upon the death of his elder brother Frank, in 1931, Russell became the 3rd Earl Russell. He once said that his title was primarily useful for securing hotel rooms.

Russell's marriage to Dora grew increasingly tenuous, and it reached a breaking point over her having two children with an American journalist, Griffin Barry. They separated in 1932 and finally divorced. On 18 January 1936, Russell married his third wife, an Oxford undergraduate named Patricia ("Peter") Spence, who had been his children's governess since the summer of 1930. Russell and Peter had one son, Conrad Sebastian Robert Russell, 5th Earl Russell, who became a prominent historian and one of the leading figures in the Liberal Democrat party.

Russell opposed rearmament against Nazi Germany, but in 1940 changed his view that avoiding a full scale world war was more important than defeating Hitler. He concluded that Adolf Hitler taking over all of Europe would be a permanent threat to democracy. In 1943, he adopted a stance toward large scale warfare, "Relative Political Pacifism": War was always a great evil, but in some particularly extreme circumstances, it may be the lesser of two evils.

Before the Second World War, Russell taught at the University of Chicago, later moving on to Los Angeles to lecture at the University of California, Los Angeles. He was appointed professor at the City College of New York in 1940, but after a public outcry, the appointment was annulled by a court judgement: his opinions (especially those relating to sexual morality, detailed in Marriage and Morals ten years earlier) made him "morally unfit" to teach at the college. The protest was started by the mother of a student who would not have been eligible for his graduate level course in mathematical logic. Many intellectuals, led by John Dewey, protested against his treatment. Albert Einstein's often quoted aphorism that "Great spirits have always encountered violent opposition from mediocre minds..." originated in his open letter in support of Russell, during this time. Dewey and Horace M. Kallen edited a collection of articles on the CCNY affair in The Bertrand Russell Case. He soon joined the Barnes Foundation, lecturing to a varied audience on the history of philosophy; these lectures formed the basis of A History of Western Philosophy. His relationship with the eccentric Albert C. Barnes soon soured, and he returned to Britain in 1944 to rejoin the faculty of Trinity College.

During the 1940s and 1950s, Russell participated in many broadcasts over the BBC, particularly The Brains Trust and the Third Programme, on various topical and philosophical subjects. By this time Russell was world famous outside of academic circles, frequently the subject or author of magazine and newspaper articles, and was called upon to offer up opinions on a wide variety of subjects, even mundane ones. En route to one of his lectures in Trondheim, Russell was one of 24 survivors (among a total of 43 passengers) in an aeroplane crash in Hommelvik in October 1948. A History of Western Philosophy (1945) became a best seller, and provided Russell with a steady income for the remainder of his life.

In a speech in 1948, Russell said that if the USSR's aggression continued, it would be morally worse to go to war after the USSR possessed an atomic bomb than before it possessed one, because if the USSR had no bomb the West's victory would come more swiftly and with fewer casualties than if there were atom bombs on both sides. At that time, only the USA possessed an atomic bomb, and the USSR was pursuing an extremely aggressive policy towards the countries in Eastern Europe which it was absorbing into its sphere of influence. Many understood Russell's comments to mean that Russell approved of a first strike in a war with the USSR, including Lawson, who was present when Russell spoke. Others, including Griffin who obtained a transcript of the speech, have argued that he was merely explaining the usefulness of America's atomic arsenal in deterring the USSR from continuing its domination of Eastern Europe.

In 1948, Russell was invited by the BBC to deliver the inaugural Reith Lectures - what was to become an annual series of lectures, still broadcast by the BBC. His series of six broadcasts, titled Authority and the Individual explored themes such as the role of individual initiative in the development of a community and the role of state control in a progressive society. Russell also continued to write about philosophy. He wrote a foreword to Words and Things by Ernest Gellner which was highly critical of the later thought of Ludwig Wittgenstein and of Ordinary language philosophy. Gilbert Ryle refused to have the book reviewed in the philosophical journal Mind which caused Russell to respond via the Times. The results was a month long correspondence in the Times, between the supporters and detractors of Ordinary language philosophy which was only ended when the Times published an editorial about the matter, which was critical of both sides but agreeing with the opponents of Ordinary language philosophy.

In the King's Birthday Honours of 9 June 1949, Russell was awarded the Order of Merit, and the following year he was awarded the Nobel Prize in Literature. When he was given the Order of Merit, King George VI was affable but slightly embarrassed at decorating a former jailbird, saying that "You have sometimes behaved in a manner that would not do if generally adopted." Russell merely smiled, but afterwards claimed that the reply "That's right, just like your brother" immediately came to mind.

In 1952, Russell was divorced by Spence, with whom he had been very unhappy. Conrad, Russell's son by Spence, did not see his father between the time of the divorce and 1968 (at which time his decision to meet his father caused a permanent breach with his mother).

Russell married his fourth wife, Edith Finch, soon after the divorce, on 15 December 1952. They had known each other since 1925, and Edith had taught English at Bryn Mawr College near Philadelphia, Pennsylvania, sharing a house for 20 years with Russell's old friend Lucy Donnelly. Edith remained with him until his death, and, by all accounts, their marriage was a happy, close, and loving one. Russell's eldest son, John, suffered from serious mental illness, which was the source of ongoing disputes between Russell and John's mother, Russell's former wife, Dora. John's wife Susan was also mentally ill, and eventually Russell and Edith became the legal guardians of their three daughters (two of whom were later found to have schizophrenia).

In 1962, Russell played a public role in the Cuban Missile Crisis: in an exchange of telegrams with the Soviet Union leader Nikita Khrushchev, Khrushchev assured him that the Soviet government would not be reckless. Russell also wrote to President Kennedy, who returned his telegram unopened.

Russell spent the 1950s and 1960s engaged in various political causes, primarily related to nuclear disarmament and opposing the Vietnam war. The 1955 Russell – Einstein Manifesto was a document calling for nuclear disarmament and was signed by 11 of the most prominent nuclear physicists and intellectuals of the time. He wrote a great many letters to world leaders during this period. He was in contact with Lionel Rogosin while the latter was filming his anti - war film Good Times, Wonderful Times in the 1960s. He also became a hero to many of the youthful members of the New Left. In early 1963, in particular, Russell became increasingly vocal about his disapproval of what he felt to be the US government's near - genocidal policies in South Vietnam. In 1963 he became the inaugural recipient of the Jerusalem Prize, an award for writers concerned with the freedom of the individual in society. In October 1965 he tore up his Labour Party card because he suspected the party was going to send soldiers to support the USA in the Vietnam War.

Russell published his three volume autobiography in 1967, 1968, and 1969. On 23 November 1969 he wrote to The Times newspaper saying that the preparation for show trials in Czechoslovakia was "highly alarming". The same month he appealed to Secretary General U Thant of the United Nations to support an international war crimes commission to investigate alleged torture and genocide by the USA in South Vietnam. The following month, he protested to Alexei Kosygin over the expulsion of Aleksandr Solzhenitsyn from the Writers Union.

On 31 January 1970, Russell issued a statement which condemned Israeli aggression in the Middle East and called for Israeli withdrawal from territory occupied in 1967. This was Russell's final political statement or act. It was read out at the International Conference of Parliamentarians in Cairo on 3 February 1970, the day after his death.

Russell died of influenza on 2 February 1970 at his home, Plas Penrhyn, in Penrhyndeudraeth, Merionethshire, Wales. He was cremated in Colwyn Bay on 5 February 1970. In accordance with his will there was no religious ceremony; his ashes were scattered over the Welsh mountains later that year.

In 1980, a memorial to Russell was commissioned by a committee including A.J. Ayer. It consists of a bust of Russell in Red Lion Square in London sculpted by Marcelle Quinton.

Russell is generally credited with being one of the founders of analytic philosophy. He was deeply impressed by Gottfried Leibniz (1646 – 1716) and wrote on every major area of philosophy except aesthetics. He was particularly prolific in the field of metaphysics, the logic and the philosophy of mathematics, the philosophy of language, ethics and epistemology. When Brand Blanshard asked Russell why he didn't write on aesthetics, Russell replied that he didn't know anything about it, "but that is not a very good excuse, for my friends tell me it has not deterred me from writing on other subjects."

Political and social activism occupied much of Russell's time for most of his life, which makes his prodigious and seminal writing on a wide range of technical and non - technical subjects all the more remarkable. Russell remained politically active almost to the end of his life, writing to and exhorting world leaders and lending his name to various causes. He was also famously noted for saying "No one can sit at the bedside of a dying child and still believe in God."

Russell determined man to be "the product of causes . . . his origin, his growth, his hopes and fears, his loves and his beliefs, are but the outcome of accidental collocations of atoms, that no fire, no heroism, no intensity of thought and feeling, can preserve an individual life beyond the grave; that all the labors of the ages, all the inspiration, all the noonday brightness of human genius are destined to extinction in the vast death of the solar system, that the whole temple of man's achievement must inevitably be buried beneath the debris of a universe in ruins -- all these things, if not quite beyond dispute, are so nearly certain, that no philosophy which rejects them can hope to stand. . . ."