The Encyclopaedia Britannica provides the following information on Bertolt Brecht:
German poet, playwright, and theatrical reformer whose epic theatre departed from the conventions of theatrical illusion and developed the drama as a social and ideological forum for leftist causes.
Brecht lived in Bavaria, where he was born(Feb. 10 1898), studied medicine, and served in an army hospital (1918). From this period date his first play, Baal ; his first success, Trommeln in der Nacht (Kleist Preis, 1922; Drums in the Night); the poems and songs collected as Die Hauspostille (1927), his first professional production (Edward II, 1924). During this period he also developed a violently antibourgeois attitude that reflected his generation's deep disappointment in the civilization that had come crashing down at the end of World War I. In Berlin (1924-33) he worked briefly for the directors Max Reinhardt and Erwin Piscator, but mainly with his own group of associates. With the composer Kurt Weill (q.v.) he wrote the satirical, successful ballad opera Die Dreigroschenoper (1928; The Threepenny Opera) and the opera Aufstieg und Fall der Stadt Mahagonny (1930; Rise and Fall of the Town of Mahoganny).
In 1933 he went into exile--in Scandinavia (1933-41), mainly in Denmark, and then in the United States (1941-47). In Germany his books were burned and his citizenship was withdrawn. The plays of these years became famous in the author's own and other productions: notable among them are Mutter Courage und ihre Kinder (1941; Mother Courage and Her Children), a chronicle play of the Thirty Years' War; Leben des Galilei (1943; The Life of Galileo); Der gute Mensch von Sezuan (1943; The Good Woman of Setzuan), a parable play set in prewar China; Der Aufhaltsame Aufstieg des Arturo Ui (1957; The Resistible Rise of Arturo Ui), a parable play of Hitler's rise to power set in prewar Chicago; Herr Puntila und sein Knecht Matti (1948; Herr Puntila and His Man Matti), a Volksstuck (popular play) about a Finnish farmer who oscillates between churlish sobriety and drunken good humour; and The Caucasian Chalk Circle (first produced in English, 1948; Der kaukasische Kreidekreis, 1949)
Brecht left the United States in 1947 after having had to give evidence before the House Un-American Activities Committee. He spent a year in Zurich, working mainly on Antigone-Modell 1948 (adapted from Hulderlin's translation of Sophocles; produced 1948) and on his most important theoretical work, the Kleines Organon fur das Theater (1949; "A Little Organum for the Theatre").
The essence of his theory of drama, as revealed in this work, is the idea that a truly Marxist drama must avoid the Aristotelian premise that the audience should be made to believe that what they are witnessing is happening here and now. For he saw that if the audience really felt that the emotions of heroes of the past--Oedipus, or Lear, or Hamlet--could equally have been their own reactions, then the Marxist idea that human nature is not constant but a result of changing historical conditions would automatically be invalidated. Brecht therefore argued that the theatre should not seek to make its audience believe in the presence of the characters on the stage--should not make it identify with them, but should rather follow the method of the epic poet's art, which is to make the audience realize that what it sees on the stage is merely an account of past events that it should watch with critical detachment. Hence, the "epic" (narrative, nondramatic) theatre is based on detachment, on the Verfremdungseffekt (alienation effect), achieved through a number of devices that remind the spectator that he is being presented with a demonstration of human behaviour in scientific spirit rather than with an illusion of reality, in short, that the theatre is only a theatre and not the world itself.