Bertolt Brecht is an endlessly fascinating figure of the 20th century. He's an artist who hit the highs and the lows of culture, and mixed it up with Marxist theory and art. He has always been my favorite poet. I think because he uses the language (in the English translation) of the newspaper headline. He and Blaise Cendrars are so un-poetic, that it makes them extremely poetic - if that makes sense. I also find Brecht very clear-thinking writer, not that I always agreed with him, but I admire his intelligence and the way he looked at the world. And of course he was a proper bastard as well. For anyone who wants to dip their toes into the world of Brecht, the Philip Glahn critical biography is a worthy introduction to the world of Brecht. It's not complete, but it will make one want to go on - and read his plays, his diaries, and his poetry/lyrics. After all, he is the man who wrote "Mack the Knife!"
On a further note, I greatly admire this press that focuses on various individuals who had either an effect on aesthetic, culture and politics. The "Critical Lives" series published by Reaktion Books is always excellent. I have most of them and the one's I read are always excellent. Priced well, excellent design, and they match the write author with the perfect subject matter. In one word: essential.