Aleksandr Isayevich Solzhenitsyn (English pronunciation: /soʊlʒəˈniːtsɨn/ Russian: Алекса́ндр Иса́евич Солжени́цын, pronounced [ɐlʲɪˈksandr ɪˈsaɪvʲɪtɕ səlʐɨˈnʲitsɨn]) (December 11, 1918 – August 3, 2008) was a Soviet and Russian novelist, dramatist, and historian. Through his writings he helped to make the world aware of the Gulag, the Soviet Union's forced labor camp system – particularly The Gulag Archipelago and One Day in the Life of Ivan Denisovich, two of his best-known works. Solzhenitsyn was awarded the Nobel Prize in Literature in 1970. He was exiled from the Soviet Union in 1974 and returned to Russia in 1994. Solzhenitsyn was the father of Ignat Solzhenitsyn, a conductor and pianist.

Aleksandr Solzhenitsyn was born in Kislovodsk, RSFSR (now in Stavropol Krai, Russia). His mother was Ukrainian widow, Taisiya Solzhenitsyna (née Shcherbak), whose father had apparently risen from humble beginnings, as something of a self-made man. Eventually, he acquired a large estate in the Kuban region in the northern foothills of the Caucasus. During World War I, Taisiya went to Moscow to study. While there she met and married Isaakiy Solzhenitsyn, a young officer in the Imperial Russian Army of Cossack origins and fellow native of the Caucasus region. The family background of his parents is vividly brought to life in the opening chapters of August 1914, and later on in the Red Wheel novel cycle).

In 1918, Taisia became pregnant with Aleksandr. Shortly after her pregnancy was confirmed, Isaakiy was killed in a hunting accident. Aleksandr was then raised by his widowed mother and aunt in lowly circumstances. His earliest years coincided with the Russian Civil War. By 1930 the family property had been turned into a collective farm. Later, Solzhenitsyn recalled that his mother had fought for survival and that they had to keep his father's background in the old Imperial Army a secret. His educated mother (who never remarried) encouraged his literary and scientific leanings and raised him in the Russian Orthodox faith; she died in 1944.

As early as 1936, Solzhenitsyn was developing the characters and concepts for a planned epic work on the First World War and the Russian Revolution. This eventually led to the novel August 1914 – some of the chapters he wrote then still survive. Solzhenitsyn studied mathematics at Rostov State University. At the same time he took correspondence courses from the Moscow Institute of Philosophy, Literature and History, at this time heavily ideological in scope. As he himself makes clear, he did not question the state ideology or the superiority of the Soviet Union until he spent time in the camps.

On April 7, 1940, while at the university, Solzhenitsyn married a chemistry student Natalia Alekseevna Reshetovskaya. They divorced in 1952 (a year before his release from the Gulag); he remarried her in 1957 and they divorced again in 1972. The following year (1973) he married his second wife, Natalia Dmitrievna Svetlova, a mathematician who had a son from a brief prior marriage. He and Svetlova (b. 1939) had three sons: Yermolai (1970), Ignat (1972), and Stepan (1973).

During World War II Solzhenitsyn served as the commander of a sound-ranging battery in the Red Army, was involved in major action at the front, and twice decorated. A series of writings published late in his life, including the early uncompleted novel Love the Revolution!, chronicle his WWII experience and his growing doubts about the moral foundations of the Soviet regime.

In February 1945, while serving in East Prussia, Solzhenitsyn was arrested for writing derogatory comments in letters to a friend, Nikolai Vitkevich, about the conduct of the war by Joseph Stalin, whom he called "Usatiy" ("one with mustachios,") "Khozyain" ("the master"), and "Balabos", (Odessa Yiddish for "the master"). He was accused of anti-Soviet propaganda under Article 58 paragraph 10 of the Soviet criminal code, and of "founding a hostile organization" under paragraph 11. Solzhenitsyn was taken to the Lubyanka prison in Moscow, where he was beaten and interrogated. On July 7, 1945, he was sentenced in his absence by Special Council of the NKVD to an eight-year term in a labor camp. This was the normal sentence for most crimes under Article 58 at the time.

The first part of Solzhenitsyn's sentence was served in several different work camps; the "middle phase," as he later referred to it, was spent in a sharashka (i.e., a special scientific research facility run by Ministry of State Security), where he met Lev Kopelev, upon whom he based the character of Lev Rubin in his book The First Circle, published in a self-censored or "distorted" version in the West in 1968 (an English translation of the full version was eventually published by Harper Perennial in October 2009). In 1950, he was sent to a "Special Camp" for political prisoners. During his imprisonment at the camp in the town of Ekibastuz in Kazakhstan, he worked as a miner, bricklayer, and foundry foreman. His experiences at Ekibastuz formed the basis for the book One Day in the Life of Ivan Denisovich. One of his colleagues political prisoners, Ion Moraru, remembers that Solzhenitsyn has written at Ekibastuz. While there he had a tumor removed, although his cancer was not diagnosed at the time.

In March 1953 after the expiry of Solzhenitsyn's sentence, he was sent to internal exile for life at Kok-Terek in southern Kazakhstan, as was common for political prisoners. His undiagnosed cancer spread until, by the end of the year, he was close to death. However, in 1954, he was permitted to be treated in a hospital in Tashkent, where his tumor went into remission. His experiences there became the basis of his novel Cancer Ward and also found an echo in the short story "The right hand." It was during this decade of imprisonment and exile that Solzhenitsyn abandoned Marxism and developed the philosophical and religious positions of his later life; this turn has some interesting parallels to Dostoevsky's time in Siberia and his quest for faith a hundred years earlier. Solzhenitsyn gradually turned into a philosophically-minded Christian as a result of his experience in prison and the camps. He repented for some of his actions as a Red Army captain, and in prison compared himself to the perpetrators of the Gulag: "I remember myself in my captain's shoulder boards and the forward march of my battery through East Prussia, enshrouded in fire, and I say: 'So were we any better?'" His transformation is described at some length in the fourth part of The Gulag Archipelago ("The Soul and Barbed Wire"). The narrative poem The Trail (written without benefit of pen or paper in prison and camps between 1947 and 1952) and the twenty-eight poems composed in prison, forced-labor camp, and exile also provide crucial material for understanding Solzhenitsyn's intellectual and spiritual odyssey during this period. These "early" works, largely unknown in the West, were published for the first time in Russian in 1999 and excerpted in English in 2006.

After Khrushchev's Secret Speech in 1956 Solzhenitsyn was freed from exile and exonerated. After his return to European Russia, Solzhenitsyn was, while teaching at a secondary school during the day, spending his nights secretly engaged in writing. In his Nobel Prize acceptance speech he wrote, "during all the years until 1961, not only was I convinced I should never see a single line of mine in print in my lifetime, but, also, I scarcely dared allow any of my close acquaintances to read anything I had written because I feared this would become known."