+1 on the Monk biography. I also really enjoyed Andrew Hodges' biography of Turing (Enigma). Even if you didn't like the movie that was based on it (I didn't),

+1 on the Monk biography. I also really enjoyed Andrew Hodges' biography of Turing (Enigma). Even if you didn't like the movie that was based on it (I didn't), the biography itself is excellent :-)