Background information of some key person in Weimar Republic

In the Weimar Culture there are serval important people play a key role. There are two people I would like to study their background information.
According Weimar culture books, Alfred Rosenberg was a Nazi ideologist and politician. Born to ethnic German parents in Tallinn, Estonia, he studied architecture at the Riga Technical Institute and engineering at Moscow University; completing his PhD studies in 1917. During the Russian Revolution he supported the counter-revolutionaries and following their failure Rosenberg emigrated to Germany in 1918.

Another person,Brecht (February 10, 1898 - August 14, 1956) was an influential German dramatist, director, and poet of the 20th century. According to the book of Weimar,
theory of theatre has heavily influenced modern theatre although it is believed that the effect of the epic theatre wears off after watching a few plays of this style. Some of his innovations, though, have become so commonly taken on that one hardly remembers the lack of them before him. Although Brecht's work and ideas about theatre are generally thought of as belonging to modernism, there is recent thought that he is the forerunner of contemporary postmodern theatre practice. This is particularly so because he questioned and dissolved many of the accepted practices of theatre (at the time) and created a uniquely political theatre that involved the audience in meaning-making. Moreover, he was one of the first theatre practitioners to incorporate multimedia into the semiotics of theatre.